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Old 03-14-2009, 07:01 AM
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CAn I put urethane clearcoat over acrylic enamel

I have painted my carwith acrylic enamel with hardener.I now want to put urethane clearcoat on it for mored durability and shine.Would they be compatible or would it wrinkle up?Any input would be appreciated. thanks phil

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Old 03-14-2009, 08:31 AM
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Did you use automotive, single stage urethane, acrylic enamel, Rust-O-Leum, or tractor/fleet enamel from TSC or the like? Huge difference. If it's tractor/truck enamel, the 20$ gallon stuff with it's activator, you can't apply ANY urethane clear over it without problems. The aklyd enamels will fade/chalk, particularly reds. Wax it.

If it's a single stage type urethane, there's no advantage (at least that I can see) that clearing will give, it's already got the same UV protection as clear.

Without stirring up a wasps nest, if you want a basecoat/clearcoat system, you'd ought to have used compatable products from the get go, not mix'n'match different products.
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Old 03-14-2009, 06:41 PM
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single stage ppg omni ae

I used ppg omni ae with hardener.I hope I can use urathaine clearcoat on it. thanls phil
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Old 03-15-2009, 12:27 AM
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When did you paint it? You really need to call the PPG tech line to find out but usually the recoat window is something like 24 hours. But honestly, call the PPG hot line and they will let you know.

Without a doubt it can be sanded with 800 and then cleared.

Brian
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Old 03-15-2009, 08:04 AM
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Unless there's a problem with the finish as it is, and a need to refinish it completely, I don't think you can, with good results, clear it. You have a window with BC/CC systems to get the clear on, or the finish has to be sanded and another BC laid down. With the system you've used, you'll have to sand the surface for some "tooth" to apply another topcoat, the sanding scratches will show up beneath the clear.

Again, there's no advantage, from a UV standpoint, in clearing that paint. It IS the finish coat.
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Old 03-15-2009, 04:12 PM
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Quote:
Originally Posted by proge
I have painted my carwith acrylic enamel with hardener.I now want to put urethane clearcoat on it for mored durability and shine.Would they be compatible or would it wrinkle up?Any input would be appreciated. thanks phil
It will work Just fine..Been there done that many times
1952
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Old 03-15-2009, 05:50 PM
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Clear over acrylic enamel

Quote:
Originally Posted by proge
I have painted my carwith acrylic enamel with hardener.I now want to put urethane clearcoat on it for mored durability and shine.Would they be compatible or would it wrinkle up?Any input would be appreciated. thanks phil
Should work Fine
There is a safe window that you can clear over the acrylic enamal with out sanding it . It works great
If your not sure about the time or have exceeded it then sand it with a very fine grit 800 or finer
This omni is great cheap alternative to some of the expensive paints out there! But some colours don't cover as easily but there's always a way around that
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Old 03-15-2009, 10:55 PM
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There is one other caution to the recommendations to sand and clearcoat your AE finish. If you have painted a solid color then sanding will not be a problem, if you have used a metallic paint then I would not recommend sanding. If you sand a metallic single stage you will most likely see some mottling of the metallic, this happens because the metallic is a fine aluminum flake and when you sand a single stage you will expose some of the aluminum particles while others stay buried inthe color, this will result in light and dark areas.
With a metallic if you are outside the recoat window then clearcoat is not a safe option.
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Old 03-31-2009, 04:15 PM
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Regarding the recoat window, can the urethane be sprayed right after the last coat of enamel has flashed, or should it be allowed to cure let's say an hour?
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Old 03-31-2009, 05:20 PM
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Quote:
Originally Posted by scrot
Regarding the recoat window, can the urethane be sprayed right after the last coat of enamel has flashed, or should it be allowed to cure let's say an hour?
Always follow the tech sheet for the Product used.
The Product Manufacture Always knows Best.
The clear coat will be the same as the recoat window for the Product
1952
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Old 01-14-2010, 10:18 AM
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The tech sheets for all the clears that I use all say that it may be applied over catalized (hardened) acrylic enamel. I have only actually done it once, on well cured paint, after wet sanding with 1200 grit paper, and it was beautiful. It was a metallic also but the 1200 was not enough to mess up any of the "glitter".
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Old 01-14-2010, 06:47 PM
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After it is clear coated can it be buffed out like a normal base coat clear coat?
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Old 01-14-2010, 09:38 PM
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Quote:
Originally Posted by MARTINSR
sanded with 800 and then cleared.

Brian
And pray like hell you don't sand too much off and have some hiding issues on an edge or something like that, lol.
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Old 01-15-2010, 09:30 AM
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Buffing Tip for Beginners

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Originally Posted by Flintstone_flyer
After it is clear coated can it be buffed out like a normal base coat clear coat?
Buff till your hearts content
Just don't burn thru the edges
I dont know how much experience you have Buffing
Here's a tip I give to beginners.
When buffing a tricky piece ...Stay away from the edges
Just do the flat panels
Saves a lot of time and rework
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Old 01-15-2010, 09:51 AM
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buffing:

when buffing flat pieces like the hood, trunk, etc. ALWAYS buff so that the buffer is rotating OFF the edge of the piece. If you let it rotate INTO the edge it will tear it up before you can catch yourself...
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