Rough-sanded bare metal is best, but primed metal will do. JavaScript is disabled. 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. Metalprep is about $20 a can. 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. See More Reviews. Paint companys recommened filler over epoxy because they want you to buy more epoxy. Primer before filler is the only way to go. Will bare root hollyhocks bloom the first year? What cars have the most expensive catalytic converters? good luck See More Reviews. sand area w/ 80 grit, bondo up. It is suitable for a range of repairs to metal surfaces that don't require painting. How long does Bondo take to dry without hardener? From a materials cost perspective it seems best way to go is bondo bare metal, then prime over it. If you put your bondo on bare metal or epoxy,,leave it. Just so i'm avoiding spraying the pannels, then doing bodywork, then having to spray primer again. Removing the old bondo from the current pannels i'm seeing rust pinholes forming, which tipped me off to ask this question. See More Reviews. 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. 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. Rough-sanded bare metal is best, but primed metal will do. Hope this helps! Here are the steps required to use Bondo, a repair putty, for rust repair. Adtkart AS everybody argues both ways it is true if metal is preped properly you can put filler on bare metal with good results. Rust converter stops the oxidation process that creates rust and prevents the rust from spreading. Do not slap Bondo onto a smooth painted surface, it is not going to stick very well. ADTAKART what makes you think he is going another route? I was taught that body filler must be applied to bare metal. bondo will work fine, I used bondy on my aluminum hood. Car bodies are very rigid structures that don’t have much, ... You will find paint peeling down to bare … 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. You CAN apply over sanded 2k primer, or bare metal. Be sure to have the area sanded with at least a 150 so the filler has some TOOTH to grab to. 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. Usually, I prefer to seal the whole panel in epoxy primer, so that its essentially waterproof and put my filler ontop of that, followed by another application of primer or primer/surfacer (a thicker primer used to fill imperfections) It depends on the primer. Bondo is an automotive body filler, often used for car and household repairs. No priming or etching is needed as long as the metal is textured and not rusted. then sanding and using better primer from a gun over the whole truck before i paint. 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. 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 won't reinvent the wheel here. The paint should be sanded off, to the bare metal, and then apply the filler. Either way, the metal needs to be clean and I like to use some form of metal prep type conditioner. Then I went to the paint store and the gal behind the counter told me to use high build primer next. Bondo over bare metal 1st. 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. Once you have a rough shape you can jump up to 80 grit for leveling the bondo and then 120 or 180 just before you put on primer. a die grinder will be your best friend. The other says primer, then Bondo. Spray in short smooth strokes from side to side across the metal, holding the can about 10 inches from the surface. 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. If rust has thinned or eaten through the panel, then the Bondo needs a backup. Make sure to sand outside of the repair area as Bondo will need to be spread and applied wider than the damaged area. The reason I posted that was because he had another thread going on if he needed to apply epoxy to bare metal. A forum community dedicated to hot rod owners and enthusiasts. What will Bondo stick to? 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. Can you apply body filler over sanded paint? 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. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! I did a test a couple of years ago on the filler over epoxy. Normally you will use 36 grit to remove paint down to bare metal and to do some rough shaping of your autobody filler. 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!! A 36-grit to 180-grit surface is ideal for body filler application. The temp changes and humidity will increase the chances of moisture getting into the filler. This is a common question I have been asked many times. 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. 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. 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. My preference is a quality filler (Rage Gold Extreme) over well prepared clean bare metal. I guess either way works. Bondo is resistant to fuel, but only after it is cured. And unlike metal, the filler won't rust over time. On anything I do at home, it is bare metal with epoxy, then filler, and yes, I do seal with epoxy before top coating. Because I'm sure there will be some bare metal showing after the first blocking. Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. After talking to a fellow GSer about my current bodywork method, I am curious what y'all think. A rust converter should be used to prepare rust-pitted surfaces for body filler. Bondo® Metal Reinforced Filler is easy to use, yet exceptionally strong for repairing and rebuilding metal, fiberglass and more. Clean and sand or scuff the surface to prepare it for body filler — it will not adhere to smooth, dirty or oily surfaces. Avoid endless forum threads and consult the manufacturer for the definitive answer. You CAN put filler on bare metal or glass with an 80grit scratch...thats PLENTY of adhesion for the bondo. Over time, rust can eat through the metallic surface of any vehicle. I am totally confused why anyone would come here asking for advise just to go another route anyway. About a year and a half ago there was a long thread on that subject. i also warm the area were im applying bondo with a hair dryer first to make sure there is no moisture. 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. 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. I do sand the metal immediately before the plastic goes on. Location. How long can you wait to plant bare root trees? You can, however, use glazing putty on top of primer sanded with 80-grit. 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. People also ask, can you Bondo aluminum hood? all my patches i did required minmal bondo as my welds did all the work. What is Bare Metal Recovery Windows server backup? I will just say this. 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. They recommend filler on bare metal. Click to see full answer Beside this, do you put Bondo on bare metal? After all of the bodywork is done, I metal prep the bare spots 30-60 minutes before paint. Any thoughts?? Sure you can. 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. The paint should be sanded off, to the bare metal, and then apply the filler. That's what I use at home when I use any at all. 3M Dynatron 492 DynaLite Lightweight Body Filler. How big of a dent can you fill with Bondo? What is the best auto body filler to use? 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. Besides, can I use body filler on bare metal? Most all of the professional shops around here use Evercoat products. Don’t use body filler on full gas tanks, or anywhere that gets hot. Evercoat 112 Rage Gold Premium Car Body Filler. 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). Similarly, can you paint on Bondo? We wipe and dry off right away with paper towels. 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