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Prepping parts for painting

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kevin

07-09-2003 14:35:27




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I am looking for some information on cleaning, prepping and painting parts. I have had
some trouble with getting paint to stay on some tractor rims. I sandblasted the rims,
cleaned them with car wash soap & water, towel dried them and then dried them with a
hair drier (a crude method I know what I thought effective).
A week later I applied two coats of Rustoleum ruddy brown primer (from a spray can) and
a week later applied several coats of Krylon JD yellow (from a spray can) to the rims.
They looked good but when I tried mounting the tires on the rim, I noticed spots of paint
missing on the rim. I can scratch off chunks of paint with my finger nail. It appears to be
both paint & primer coming up.

What did I do wrong and how can I get the paint to stick?

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RandyD

07-13-2003 17:34:38




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 Re: Prepping parts for painting in reply to kevin, 07-09-2003 14:35:27  
From Rust-Oleum FAQ
"Can I use Rusty Metal Primer on clean metal? No. The fish oil that is in the primer needs to penetrate into rust to seal out air and moisture. If there is no rust, the oil will rise to the surface making adhesion of the finish coat difficult."

If you would have used a Rust-Oluem paint, it would have been Okay, sorry.
Randy

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Unimog

07-09-2003 20:16:56




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 Re: Prepping parts for painting in reply to kevin, 07-09-2003 14:35:27  
I think the problem is the primer. If you use
Rustoleum brown primer it is made for use on
rusty surfaces. You sandblasted to bare metal
so you should have used their auto primer. It
comes in light gray and black I believe. The
rusty metal primer has an oil in the formular
designed to bond to rust. If there is no rust
then the oil stays on the surface and the top
coat will not bond as well.

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CNKS

07-09-2003 18:24:01




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 Re: Prepping parts for painting in reply to kevin, 07-09-2003 14:35:27  
I sand the rims even after sandblasting, scrub them with a brush and soap and water, then apply several applications of wax and grease remover (PPG DX 330). In fact I do that to the whole tractor. Use a spray gun and quality paint and you will get better results.



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TO-35Man

07-09-2003 16:21:59




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 Re: Prepping parts for painting in reply to kevin, 07-09-2003 14:35:27  
I suspect the car wash was at fault even though you dried them...It probaly left a film on them I use final wash or paint thinner after sanblasting just blow off with compressed air and wipe em down and wait 1/2 hour and prime. I always scuff primer with scotch brite pad before painting. Its always worked for me I've never had paint peal or flake.
hope this helps....



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