Temporary Bare Metal protection
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Freshman User
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From: rockville, maryland
Temporary Bare Metal protection
Hi, I've grinding down my welds in the evenings and expect to be applying bondo over the weekend. I understand the Bondo should only be applied to bare metal. Until I'm ready can I spay the metal with oil or WD-40 to prevent any corrosion (rather than primer)? Or should I not worry about it and just re-grind/sand the day I do Bondo? The truck is stored outside and we'll probably get some rain tomorrow.
mitch
mitch
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From: North Stonington Ct
I'm no expert but I would think oil would be a no-no. The oil will be hard to get of and the bondo won't stick. I would think a quick coat of primer from a can would be better. What the heck do I know. Bodywork and paint people?
Posting Guru
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From: Williamson, NY
The only kind of primer that you should apply bondo over is epoxy primer, but you should scuff it up with some sandpaper first to promote adheasion. BTW even if you do put bondo directly over the metal you should epoxy prime over that if you are not going to paint it right away. The bondo can soak up moisture and you'll end up with more rust if it's not protected.
Mountain Pass
Joined: Feb 2004
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From: West Vancouver BC Canada
Temporary Bare Metal Protection
Eastwood supplies a product called Metal Wash which it advertises will prevent flash rust until you prime. R-M coatings supplies Metal Conditioner for the same purpose. I believe both contain a phosphate compound that creates a barrier to moisture plus improves adhesion of paint to metal. I'll used this weekend after sandblasting to keep flash rust off while welding in replacment steel for the rusted bits on my F250. Jeff
Senior User
Joined: Jul 2005
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From: Lake Worth, Fla.
Do yourself a favor and do not spray any kind of oil, on what you're trying to prepare to paint. Spray a primer on your work and sanded off if you need to and re-spray it. It will save you a lot of heart ache in the long run.
Elder User
Joined: May 2004
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From: MN - NW of Twin Cities
Originally Posted by G BOBKA
Do yourself a favor and do not spray any kind of oil, on what you're trying to prepare to paint. ............
Some have suggested a product called piclex (spelling???) as one option.
Personnally I would spray it with an epoxy primer and then apply the body over it. The epoxy may have to be scuffed up first if more than 7 days has elapsed between application of epoxy and application of filler. Check the data sheet for the epoxy.
Last edited by brucewolff; Sep 27, 2007 at 12:58 PM.
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Elder User
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From: in country near Boone, IA
So, if someone has sprayed WD-40 on bare metal (like inside the cab, cab posts, etc), and then had the cab sand blasted, wiped down with "wax and grease remover" and then sprayed with epoxy primer, that should work, right? No paint adhesion problems as long as everything was wiped down really well after media blasting and before priming? I hate to weld in a small area and have bare metal sit for so long. I really don't want to mix up the epoxy primer just for one little area on the cab. Hoping to spray epoxy on everything at one time after all repair work is done. anybody have different opinions???
Last edited by johaner78; Oct 4, 2007 at 09:57 PM.
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Tuned
Joined: Aug 2007
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From: Maryland
Originally Posted by johaner78
So, if someone has sprayed WD-40 on bare metal (like inside the cab, cab posts, etc), and then had the cab sand blasted, wiped down with "wax and grease remover" and then sprayed with epoxy primer, that should work, right? No paint adhesion problems as long as everything was wiped down really well after media blasting and before priming? I hate to weld in a small area and have bare metal sit for so long. I really don't want to mix up the epoxy primer just for one little area on the cab. Hoping to spray epoxy on everything at one time after all repair work is done. anybody have different opinions???
Actually if you were to do that, you should use your preclean first to get rid of the oil (WD-40), and then media blast. Depending on how aggressive the type of media, you could be depositing the oil particulate into the pits caused by the media blasting, making the oil even more difficult to remove. Plus, the media blasting could be scattering the WD-40 elsewhwere in the cab. Personally, I would mix up just enough of the epoxy primer and brush it on to give yourself some protection. Who says it has to be sprayed to protect from rust? Then when you're ready to paint the entire thing, scuff up where you painted, and spray the whole cab. This way you'll have much less chance of fisheye/contamination from the oil.
Elder User
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From: in country near Boone, IA
thanks MP&C, those are a couple good points I haven't thought about. If I mixed up some epoxy primer in a plastic container (more than what I need for one little spot that needs primer) what is the shelf life of the mixed product if it was in a plastic container with a lid? A few hours? A few days? A month? Probably lots of variables to that question.
Posting Guru
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From: Williamson, NY
According to the Nason epoxy primer I am using it says the pot life of the mixed primer/activator is 24 hours and that you you should wait at 1/2 to 1 hour (depending on Temperature) after mixing before using the primer.
Elder User
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From: in country near Boone, IA
thanks cujo8, i was afraid of that. kind of a pain to mix up such a small dab for what i usualy need to prime that I thought i would be easier to just spray with WD40, etc. maybe i'll just use some primer in a puff can for temporary coverage then have it media blasted adn then spray on good coat of epoxy. Then I won't have to worry about fisheye's.
Posting Guru
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From: Williamson, NY
That is why I suggested using Eastwood's Rust Encapsulator earlier....Just open the can and brush it on....close the can and your done. You can sand it off later if you want before you prime.
