paint wrinkles - why?


i am currently just about ready to spray clear coats on a guitar body project...i have used a hi gloss oil based enamel for solid colour and want to spray polyurethane clear coats over it for durability.....i tried it on a piece of scrap and found that the solid coat wrinkled when i put on the polyurethane clear coat....why would that happen??
the last thing i need right now is for the same thing to happen on the guitar body after putting so much work into it.... thanks for any input zz zz
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On Wed, 13 Jul 2005 10:16:04 GMT, the opaque snipped-for-privacy@hfksdfse.com (zz) clearly wrote:

Karma, dude. Ruining a perfectly good finish with polyurinestain? It's gotta be karma. Oh, and a slightly wet surface underneath, or possibly a mismatch in solvent bases of the finishes, like lacquer over enamel or vice versa. Try it again after letting the finish settle, dry, and cure for a week or two.
Better yet, ask your local paint store for a pair of -compatible- finishes.

I hear that. G'luck.
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zz wrote:

Because spray urethanes often (always?) have solvent(s) in them other than plain old thinner and those can attack other finishes.
Another possibility: if the color coats were pretty thick and not really dry they could have acted like "wrinkle paint"...after putting on the poly and it dried the color paint continued drying and in so doing shrunk causing the wrinkles. I'm betting on the solvent theory though... ______________________

It would. You might try another scrap just misting on a *very* light coat of urethane and letting it dry as a barrier. Or using another barrier...maybe brush on poly?
-- dadiOH ____________________________
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On Wed, 13 Jul 2005 10:16:04 GMT, snipped-for-privacy@hfksdfse.com (zz) wrote:

more work and less satisfying than it's worth.
My Suggestion: Call Target Coatings at 800-752-9922 and order a quart of their 9000 series Super Clear Polyurethane ($19.95 plus ship). If you're willing to pay the freight they can have Fedex deliver it to your door next day.
http://www.targetcoatings.com
Being a water-borne product it wont react with your undercoats and you'll love the final finish. Unlike solvent based lacquers, this stuff tends to look absolutely horrible as you're applying it, but just follow your normal spraying practices and let it dry good and you'll be amazed. If you put it on a little heavy, then let it dry for 2-3 weeks and polish it out you'll get that showroom shine that you're probably looking for.
A big plus is that it don't stink :)
The usual disclaimer applies, I'm just one happy customer. Target has really pushed the envelope with their formulations, to the point that they now have a workable product for almost any wood finishing application.
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wrote:

forget about clear coating....prolly just shoot a couple more colour coats rub it back and buff it out ,,,, zz
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