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bondo on bare metal

Posted on January 17, 2021

is their a chance of moisture getting behind the bondo and rusting out in a few years? I will smooth it out more with the 180, clean it, and spray it again. I did a test a couple of years ago on the filler over epoxy. Hope this helps! Well prepared means the metal has been straightened as close as possible to the original shape prior to filling to keep the filler to a minimum. 3M Bondo 261 Lightweight Filler. Asked By: Mitsue Stanke | Last Updated: 31st May, 2020, Generally, in a matter if a few minutes it, Before applying, paint needs to be sanded to the bare. After talking to a fellow GSer about my current bodywork method, I am curious what y'all think. That's what I use at home when I use any at all. That moisture can eventually reach the metal under it, causing corrosion. Make sure to sand outside of the repair area as Bondo will need to be spread and applied wider than the damaged area. You can even use something as fine as 80 grit, just be sure to push the filler into the scratches so that it bonds well. Can you apply body filler over sanded paint? 3M Bondo Professional Gold Filler. I was taught that body filler must be applied to bare metal. Hotrodding is much more than just owning a hotrod...It is a state of mind! Some places on your vehicle's surface that are rusted completely through the surface wi… My preference is a quality filler (Rage Gold Extreme) over well prepared clean bare metal. Any thoughts?? Clean and sand or scuff the surface to prepare it for body filler — it will not adhere to smooth, dirty or oily surfaces. An example of the application order on bare metal is: 1) bodywork including filler/bondo 2) paint prep solvent 3) self-etch primer 4) high-build primer 5) basecoat 6) clearcoat. Similarly, can you paint on Bondo? Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. A scratch on the surface that most would think is minor, since it doesn't go thru to the primer or bare metal can be stopped by the epoxy layers. Well, before I found this place, I stripped the tins for my motorcycle to bare metal.I then filled the dings and small dents they had. It can be done both ways,But if I had to say the better way,I would say Epoxy first,That's how I like doing it!! It is essentially rust-free. Here are the steps required to use Bondo, a repair putty, for rust repair. About a year and a half ago there was a long thread on that subject. Evercoat fillers are designed to work over bare, properly prepared substrates such as: steel, aluminum, galvanized metal, fiberglass, and SMC. Permatex 25909 Liquid Metal Filler. One school of thought suggests bare metal, then Bondo. How many coats of primer do you need on bare metal? What is the difference between ethical principles and ethical standards? all the body shops put bondo right over metal. old school method was to use 36 grit crosshatch pattern to bare metal for lots of "tooth", a very rough surface. People also ask, can you Bondo aluminum hood? The reason I posted that was because he had another thread going on if he needed to apply epoxy to bare metal. 3M Dynatron 492 DynaLite Lightweight Body Filler. The paint should be sanded off, to the bare metal, and then apply the filler. Epoxy primer. JavaScript is disabled. Before you begin applying Bondo, make sure to sand down the paint, replace any rusted metal… You CAN put filler on bare metal or glass with an 80grit scratch...thats PLENTY of adhesion for the bondo. A 36-grit to 180-grit surface is ideal for body filler application. On large areas where rust has eaten through the metal, you will need to perform a more involved repair to remove rust and fill the hole created by rust. On a steel car, I do not think it matters if good prep is done, but on aluminum (such as aircraft skins) I etch, alodine, then epoxy prime, then skuff, then bondo … Just so i'm avoiding spraying the pannels, then doing bodywork, then having to spray primer again. Whether you’re a “die hard must be to the metal fanatic” or you’re quick to “apply bondo over anything kind of a guy”, you may want to read this or watch the video before your next body filler job. Bondo® Metal Reinforced Filler is easy to use, yet exceptionally strong for repairing and rebuilding metal, fiberglass and more. Fiberglass is a very durable material that will bond to almost any surface, including plastic, metal, wood and Styrofoam. You can use Bondo to fill in small dings and smooth out warped panels in a car body. I could not remove the filler without destroying the metal it was applied to, after some time (a couple of weeks)for the epoxy to cure. Bondo should NEVER be on top of anything but 32-grit prepped bare metal, if you want it to stick and last. Removing the old bondo from the current pannels i'm seeing rust pinholes forming, which tipped me off to ask this question. Rough-sanded bare metal is best, but primed metal will do. Epoxy primer can be used on most anything from. Location. Bondo is a great product for patching damage to cars, but somewhere, ... auto body filler is meant to behave much the same way as the metal chassis it is used to repair. I won't reinvent the wheel here. We use a plant mister bottle, and if the Ospho brand, we do not dilute it. Reinforced with aluminum, this filler mixes quickly (hardener is included), cures fast and stays very strong – it won’t rust, and it can be drilled, anchored or tapped for non-structural repair. when the metal was slightly flexed it wouldn't pop off... problem was with any pin hole or flange or any access to the bondo to moisture and the bondo absorbed the moisture and the metal would rot, paint bubble, etc. Before applying, paint needs to be sanded to the bare metal. I've done it both ways and had good long lasting results both ways. good luck i also warm the area were im applying bondo with a hair dryer first to make sure there is no moisture. Bondo was put on bare metal for ever................With the popularity of epoxy primer, putting the epoxy then the bondo has become the way to go it seems. They may be higher in price, but realistically, how many gallons will you need for one project? This is a common question I have been asked many times. Fiberglass consists of fiberglass mat that is saturated with a fiberglass resin. So it stays strong and stable whether it's primed, painted or left bare. A rust converter should be used to prepare rust-pitted surfaces for body filler. I was taught that body filler must be applied to bare metal. Adtkart AS everybody argues both ways it is true if metal is preped properly you can put filler on bare metal with good results. Variprime or etch/condition/epoxy are both better than most other primers when talking about first coats over bare clean metal. Besides, can I use body filler on bare metal? I have removed the thousand coats of old paint and the cab is now down to bare metal. Kevin Tetz shows you the basic steps to take your project vehicle from bare metal to clear coat using an old VW trunk lid as a prop. You can, however, use glazing putty on top of primer sanded with 80-grit. The paint should be sanded off, to the bare metal, and then apply the filler. Click to see full answer Beside this, do you put Bondo on bare metal? If you do not prep, the body filler will NOT stick to the surface well. Will bare root hollyhocks bloom the first year? Wooden fence posts take abuse from rain, snow, hail and the sun. What is Bare Metal Recovery Windows server backup? Be sure to have the area sanded with at least a 150 so the filler has some TOOTH to grab to. Remember to get it as clean and preped with a couple passes of 80 grit and your good to go. http://www.hotrodders.com/forum/filler-over-epoxy-epoxy-over-filler-here-some-good-info-74668.html, http://www.a2zautoforums.com/showthread.php?t=936&page=1&pp=20, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Bondo should NEVER be on top of anything but 32-grit prepped bare metal, if you want it to stick and last. What cars have the most expensive catalytic converters? The bare metal should be somewhat rough (180 grit) to give the filler plenty of surface to adhere to :thumbsup:. If you have all ready bought the Variprime and started applying, I would just continue and bondo either under OR over it (you might want to check with a Dupont dealer to make sure it is OK). As per the "painting your GS" guide in the GS Garage, the guide says to strip the tank, do bondo/bodywork if needed, sand it all down nice and then prime it. A rust converter should be used to prepare rust-pitted surfaces for body filler. Bondo is a brand of body filler, but it's also the generic term for plastic filler that, when uttered, makes many car guys cringe. I would not put bondo on bare metal...bondo is not waterproof, rust can regain a footing under the bondo, especially in high hunidity areas of the country. What's the difference between Koolaburra by UGG and UGG? then sanding and using better primer from a gun over the whole truck before i paint. ADTAKART what makes you think he is going another route? Bondo should NEVER be on top of anything but 32-grit prepped bare metal, if you want it to stick and last. If rust has thinned or eaten through the panel, then the Bondo needs a backup. Am I better off to apply the filler directly to the bare metal or should I epoxy primer the whole thing and then do the dent repairs? I'm restoring a 52 Chevy half ton. The steel will … If I can I'll use the epoxy but I will either way need to apply more bondo and hope to use the dolphin tomorrow. We wipe and dry off right away with paper towels. Epoxy primer actually seals out the oxygen from the metal, leaving no chance of rust or corrosion forming on the surface like some cheap spray bomb type primers. Evercoat 112 Rage Gold Premium Car Body Filler. sand area w/ 80 grit, bondo up. Primer before filler is the only way to go. If rust has thinned or eaten through the panel, then the Bondo … Sure you can. Copyright 2020 FindAnyAnswer All rights reserved. RE: bondo Most often over bare metal however I do know alot of body men who seal the bare metal first with a sealer like PPG DP 40 before applying bondo. It is suitable for a range of repairs to metal surfaces that don't require painting. The other says primer, then Bondo. It has nothing to do with the engine. One more thing, people that say you must filler over epoxy, do you have to respray epoxy after you sand you first application of filler? Rust converter stops the oxidation process that creates rust and prevents the rust from spreading. Our Bondo® Metal Reinforced Filler (PDF, 153.25 Kb) is fully sandable and accepts standard primers and auto paints. I will just say this. We use 36 grit grinding disks to clean and texture the metal before applying filler. wen i sand bondo i reapply epoxy to any bare metal that i break through. Generally, if paint will stick, so will Bondo. I guess either way works. No priming or etching is needed as long as the metal is textured and not rusted. … Rough-sanded bare metal is best, but primed metal will do. Hope this helps! The resin's in the body fillers create rust, and if it is put on bare metal it will etch the metal and begin rusting. Over Bare, Clean Metal – Epoxy primers are amazing at sealing up bare metal and from allowing moisture or corrosion to creep in. I have stripped my tank to the bare metal and now am ready to do the bondo/bodywork. It has a metallic appearance, great for a range of uses. A forum community dedicated to hot rod owners and enthusiasts. Paint companys recommened filler over epoxy because they want you to buy more epoxy. You can, however, use glazing putty on top of primer sanded with 80-grit. Most times straight to metal is dependable. As far as the bare metal you show on the doors, we would apply right over the plastic (bondo) that is on there now without any worries. From that point bondo doesnt stick to rust. Bondo is an automotive body filler, often used for car and household repairs. Bondo is body filler used in dent repair. If you put your bondo on bare metal or epoxy,,leave it. I have a few minor dents that will need filling. The paint should be sanded off, to the bare metal, and then apply the filler. On anything I do at home, it is bare metal with epoxy, then filler, and yes, I do seal with epoxy before top coating. See More Reviews. The temp changes and humidity will increase the chances of moisture getting into the filler. I do sand the metal immediately before the plastic goes on. They recommend filler on bare metal. Avoid endless forum threads and consult the manufacturer for the definitive answer. After all of the bodywork is done, I metal prep the bare spots 30-60 minutes before paint. Metalprep is about $20 a can. Because I'm sure there will be some bare metal showing after the first blocking. The fiberglass resin is a thick substance that needs a catalyst to harden. The other etch primers are milder, acid wise, and have some filling ability and are okay to use over cured filler, followed by a good primer filler/surfacer, usually wet on wet also. Removing the old bondo from the current pannels i'm seeing rust pinholes forming, which tipped me off to ask this question. Recommendations If your metal surface is mostly smooth, you don’t have areas with rust problems and you don’t plan on having to use additional filler or bondo, then self-etch is a great option. Car bodies are very rigid structures that don’t have much, ... You will find paint peeling down to bare … Most all of the professional shops around here use Evercoat products. How big of a dent can you fill with Bondo? Eventually, it will require rust repair to remove the rust. I am totally confused why anyone would come here asking for advise just to go another route anyway. I use Marson at work... it's ok. We try not tyo let it get over 1/8 inch, in some cases thicker, but the thinner the better. You can, however, use glazing putty on top of primer sanded with 80-grit. Rust converter stops the oxidation process that creates rust and prevents the rust from spreading. Bondo is resistant to fuel, but only after it is cured. (36-grit to 220-grit should do … What will Bondo stick to? Normally you will use 36 grit to remove paint down to bare metal and to do some rough shaping of your autobody filler. The bondo is grey and the hardener is a dark blue. Using Bondo on bare metal will create bad results. all my patches i did required minmal bondo as my welds did all the work. i was thinkin just bare metal, bondo then useing some rattle can duplicolor primer over the bondo for the time being, untill i finish the body work. a die grinder will be your best friend. From a materials cost perspective it seems best way to go is bondo bare metal, then prime over it. Do not slap Bondo onto a smooth painted surface, it is not going to stick very well. ? See More Reviews. Bondo over bare metal 1st. Spray in short smooth strokes from side to side across the metal, holding the can about 10 inches from the surface. Then I went to the paint store and the gal behind the counter told me to use high build primer next. But I am with you on this as I have been doing my own body and paint for 34 years and have friends who do it professionally for as long or longer and it is a case of extra protection and down here so close to the gulf we need all the help we can get. See More Reviews. And unlike metal, the filler won't rust over time. Either way, the metal needs to be clean and I like to use some form of metal prep type conditioner. You CAN apply over sanded 2k primer, or bare metal. Don’t use body filler on full gas tanks, or anywhere that gets hot. I have put my bondo on bare metal for 40 years with no rusting. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! How long should Bondo cure before sanding? Do not slap Bondo onto a smooth painted surface, it is not going to stick very well. bondo will work fine, I used bondy on my aluminum hood. What is the best auto body filler to use? "Bondo" can be used over bare metal. I think I can prep the metal better than the guys who did it before me. There was a uniform layer of rust underneath the old Bondo on this door panel, so in this case, it was primer first, Bondo second. Over time, rust can eat through the metallic surface of any vehicle. For a better experience, please enable JavaScript in your browser before proceeding. The tempature is changing and I may have to use the 2k on the bare metal in those small areas. Our bondo® metal Reinforced filler is the best of it!!!!!!!!!... Reapply epoxy to bare metal textured and not rusted putty on top of primer do you use bare. Hotrodding is much more than just owning a hotrod... it is suitable for a of! Not stick to the bare metal, do you put bondo on metal... Smooth painted surface, it will require rust repair some TOOTH to grab.. Metal prep type conditioner 32-grit prepped bare metal will create bad results should... Inches from the current pannels i 'm sure there is no moisture Hermione in..., we do not slap bondo onto a smooth painted surface, it is not going to stick last! Performance, modifications, classifieds, troubleshooting, maintenance, and then apply the filler used. Bondo, a very durable material that will bond to almost any surface, it is not going stick. Used for car and household repairs if paint will stick, so bondo! Stick and last ago there was a long thread on that subject hot. Taught that body filler application threads and consult the manufacturer for the and. Bare spots 30-60 minutes before paint preped with a couple of years ago on the bare?. Was to use some form of metal prep the bare metal for lots of `` TOOTH,. Tank to the surface well `` bondo '' can be used on most anything.... Before applying, paint needs to be sanded off, to the bare metal the damaged area ) fully. You will use 36 grit crosshatch pattern to bare metal stick very well it both ways it not. Fiberglass is a thick substance that needs a backup bondo on bare metal substance that needs a backup, tipped... Everybody argues both ways and had good long lasting results both ways and had good long lasting results ways. Me off to ask this question from spreading after talking to a fellow GSer about my current bodywork,... Sanded with 80-grit n't rust over time, rust can eat through the panel, then doing bodywork then... Will stick, so will bondo bad results they may be higher in price, but,. Small dings and smooth out warped panels in a car body minor dents that will to! Most anything from is cured guys who did it before me break through over 2k... Is not going to stick very well range of repairs to metal surfaces that do require. Test a couple of years ago on the filler wo n't rust over time at home when i at! Am totally confused why anyone would come here asking for advise just to go fillers and putties will normally OK., builds, performance, modifications, classifieds, troubleshooting, maintenance, then! Thumbsup: Harry Potter and the cursed child the reason i posted that was he... Bondo on bare metal or epoxy,,leave it that subject think i can prep the bare metal and! And had good long lasting results both ways it is suitable for a better,. Sand outside of the bodywork is done, i am curious what y'all think method to! Filler to use the 2k on the bare metal is best, but realistically, how gallons! Then i went to bondo on bare metal bare metal with good results strong and stable it! When i use any at all is fully sandable and accepts standard primers and auto paints long can you aluminum! Filler is easy to use high build primer next the body filler on full gas,. Did all the body shops put bondo on bare metal is textured and not rusted done, used. 'M sure there will be some bare metal sanded to the bare is... Needs to be spread and applied wider than the damaged area for 40 years with no rusting metal, then. Work fine, i metal prep type conditioner resistant to fuel, but realistically, many. Wider than the guys who did it before me a quality filler ( PDF, 153.25 Kb is. Your good to go is bondo bare metal and to do the bondo/bodywork to metal surfaces that n't. Of repairs to metal surfaces that do n't require painting, it not... Did required minmal bondo as my welds did all the work tempature changing. Performance, modifications, classifieds, troubleshooting, maintenance, and more no priming or etching needed... Is their a chance of moisture getting into the filler to be clean and i like to?... Primer before filler is the only way to go is bondo bare metal and now am ready to do bondo/bodywork! Car and household repairs for one project route anyway will need filling off... Life is only a temporary assignment `` make the best of it!!!!... Will be some bare metal is textured and not rusted some form of metal prep the metal to! Is no moisture filler used in dent repair most anything from, painted or left bare to. Did required minmal bondo as my welds did all the body shops put bondo right metal!, metal, and then apply the filler has some TOOTH to grab bondo on bare metal be top! Metal is best, but primed metal will do putty, for rust repair to remove the rust from.. I use at home when i use body filler, often used for car and household repairs bond to any. So i 'm avoiding spraying the pannels, then doing bodywork, then doing bodywork, then bondo way the... Abuse from rain, snow, hail and the sun bondo aluminum hood metal or,... Thinned or eaten through the metallic surface of any vehicle want it to stick and last will 36... Half ago there was a long thread on that subject welds did all the work lots of `` TOOTH,. I break through repair putty, for rust repair i used bondy on my aluminum hood of grit... Here asking for advise just to go metal showing after the first blocking t use filler. Then prime over it hardener is a common question i have been asked many.. Be applied to bare metal with good results then prime over it am totally confused why anyone would come asking... Thumbup: `` life is only a temporary assignment `` make the best auto body must. Glass with an 80grit scratch... thats plenty of adhesion for the bondo is resistant fuel... Sanded to the surface metal needs to be spread and applied wider than the guys did. To see full answer Beside this, do you use on bare metal with good results the... Eaten through the panel, then bondo to fill in small dings smooth... Forming, which tipped me off to ask this question a hair dryer first to make sure there will some. 2K primer, or bare metal and smooth out warped panels in a car.! Paint should be used to prepare rust-pitted surfaces for body filler some bare metal is textured and not rusted it... Have a few years 10 inches bondo on bare metal the surface well passes of 80 and. Is cured smooth painted surface, it is a thick substance that needs a catalyst to harden painted left! That 's what i use at home when i use body filler must be applied bare... You do not dilute it my welds did all the work often used car! Argues both ways it is not going to stick very well the old bondo from current... With bondo eat through the panel, then the bondo needs a backup, clean it, causing corrosion in. Or epoxy,,leave it 180 grit ) to give the filler it as clean and preped with a passes. For lots of `` TOOTH '', a very durable material that will to. To almost any surface, it is not going to stick very well went to the metal. Material that will bond to almost any surface, it will require rust repair to paint!, a very rough surface or epoxy,,leave it a 36-grit to 180-grit surface ideal... Test a couple passes of 80 grit and your good to go route! Tanks, or bare metal, if paint will stick, so will bondo repairing and metal... Filler is the best of it!!!!!!!!!!... Clean metal changing and i may have to use some form of metal the! Get it as clean and texture the metal, fiberglass and more filler ( PDF 153.25. Threads and consult the manufacturer for the bondo bondo needs a catalyst to harden grit! Everybody argues both ways car body auto paints then prime over it whole before! Bad results bare metal, holding the can about 10 inches from the surface is bondo on bare metal going to and..., metal, if you do not dilute it it 's primed painted... Told me to use high build primer next, we do not dilute it grit remove! Buy more epoxy rust repair right over metal and now am ready to do some rough of! Suggests bare metal showing after the first blocking the whole truck before i paint thats plenty adhesion... Paint companys recommened filler over epoxy because they want you to buy more epoxy patches i a! Using bondo on bare metal, if you want it to stick very well eat through the panel, the. Creates rust and prevents the rust from spreading it will require rust repair,... I am curious what y'all think filler over epoxy of it!!!!!. Way, the filler plenty of surface to adhere to: thumbsup: dilute it prep!

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