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Old 10-11-2010, 01:05 PM
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Trouble laying paint

I'm having trouble laying paint on a fiberglass hood. I'm having trouble setting up my paint gun. After I spary the paint, about 1 sec later the paint tears apart creating those blemishes. Is it water in my lines, dirt on the hood, etc? I have two air compressors linked together running through a 25 ft rubber hose into a pipe system, water/oil separator and then through a 50 ft rubber hose.

I washed the hood with a scotch brite pad and soapy water. A week later I sand the hood and after sanding the hood I used Silicone wax and grease remover. The hood sat for at least a half hour and then I used a tack rag before spraying with SPI epoxy primer.



Any suggestions?

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Old 10-11-2010, 01:23 PM
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Those are fish eyes. Something contaminated your hood.
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Old 10-11-2010, 01:31 PM
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So maybe I should re-scrub the hood and try again
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Old 10-11-2010, 01:39 PM
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You need to find out what could have caused it. Armorall or something that had silicon in it can cause fish eyes. It might be embeded in the fiberglass. It can also be in your air delivery system. Even oily hands can cause fish eyes. They make paint addatives for fish eyes.

Last edited by V8&4spd; 10-11-2010 at 01:49 PM.
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Old 10-11-2010, 02:02 PM
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scuff it good then clean it good. do not let the w&g remover dry. wipe it off while wet. clean it twice then reshoot the epoxy. do not use any kind of fish eye eliminator. that crap is for car lot work .
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Old 10-12-2010, 06:41 AM
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It needs a lot more cleaning,get the primer off,Try a mold release agent first (W&G remover wont get it all off),resand and then wax& grease again twice,like Shine says dont let it dry,put it on wet and wipe it off,Then spray a spot to see if its working,if not repeat all the steps again.
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Old 10-12-2010, 02:07 PM
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It appears to have been bad prep. The silicone wax must have stayed on and caused the fish eyes. I shot a clean piece of metal and had no problems....




maybe the Jason degreaser is no good. Can I use acetone on fiberglass?
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Old 10-12-2010, 02:42 PM
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Degreaser???
ONLY use Wax & grease remover thats made just for painting.....that could be your problem right there..

the mold release agent smells like vineger if thats any help.They use it to keep the parts from sticking to the mold,there's usually some on the parts and it has to come off..is there any paper work telling you how to prep for paint?
If you use vineger, apply it with a scuff pad make sure you rinse it well with soap&water...
what ever you do dont spray a heavy coat of primer right away if it does it
again it'll make it harder to get back off..
Heres what I would do ....sand it with180 DA scrub in W&G nice and wet with a red scuff pad keeping it all wet for a couple minutes with a pump sprayer ,scuff it again, all the while its wet with W&G then wipe it all dry...that should do it ..try priming again ,cautiously,if it starts again you'll need the mold release agent ...or vineger...in a pinch..

Last edited by deadbodyman; 10-12-2010 at 02:48 PM.
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