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Old 06-05-2003, 05:13 AM
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Post tiny bubbles in clear coat

Hi! I need help again. I was wet sanding my clear coat lastnight and I noticed that saw small tiny bubbles in the clear and when I sanded to much down to the bubbles, the bubbles turned into white dots when I polished the paint. How do I fix this or do I have to put another coat of clear? THanks for any suggestions <img src="graemlins/sweat.gif" border="0" alt="[sweat]" />

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Old 06-05-2003, 07:00 AM
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Sounds like you got trash from the gun, or the clear had some lumps of pigment that did not dessolve. I think you will have to sand them out,If you go through, you`ll have to reshoot the clear. Don`t get in a hurry,I think you can save it.Good Luck

Troy;
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Old 06-05-2003, 07:24 PM
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Ive seen this before and more often with Dupont clear I have seen guys take mix up a small amount of clear and drop clear in the holes and wet sand it smooth
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Old 06-05-2003, 08:54 PM
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It sounds to me like you have solvent popping.This happens for several reasons, some are the clear is to thick or your first coat of clear skimmed over from drying to long before applying your second coat or you used to fast of clear or activator.What happens is the solvent from your first coat escapes througha dried film of clear and the clear is to dry for it to flow over leaving real small pits.
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Old 06-06-2003, 05:19 AM
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Thanks guys - so How do I fix this? I used PPG 2042 which has a very fast dry time and I think you guys are right about solvent popping. What happened was that we mixed a gallon of 2042 to paint a whole car and while we went through the first round, half the clear we had left started hardening. I was going to cry because that stuff was not cheap. Can I paint clear over the solvent popping or do I need to just put another coat of color and fresh clear after wet sanding. How do people fix this? - THanks again for your suggestions.

jon
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Old 06-06-2003, 06:01 AM
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I`ve never seen solvent popping leave a white spot, just a pit when sanded. <img src="confused.gif" border="0">
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Old 06-06-2003, 06:07 AM
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Man, how long did it take you to get around that car. I had no idea Clear would harden in the can in a matter of hours. In my experience, it takes a day or so. I would bet you are going to have to sand the problem out and and just reclear.

I think you will have to sand untill you are down to the first coat and the bubbles are gone. If you break through anywhere, you will have to recolor that area or it will show when you reclear. It will be time consuming and you will have to be very careful if you dont want to have to recoat everything.

Also, I would not try to polish it out from this point on. The polish will build up in the bubbles causing the white spots. If you get it all sanded out, the new coat of clear should fill any tiny pits that are left.

Chris
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Old 06-06-2003, 06:08 AM
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[quote]Originally posted by troy-curt:
<strong>Sounds like you got trash from the gun, or the clear had some lumps of pigment that did not dessolve. I think you will have to sand them out,If you go through, you`ll have to reshoot the clear. Don`t get in a hurry,I think you can save it.Good Luck

Troy;</strong><hr></blockquote>

Have you got white dots or pits?

Turbo is right on the money.
Slow and easy. Troy;

[ June 06, 2003: Message edited by: troy-curt ]</p>
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Old 06-06-2003, 06:35 AM
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Sorry for the confusion. They look like microscopic bubbles in the paint if I look at them carefully and can be seen as tiny white dots when I wet sand it with 1000 grit paper or polish it. I assume they are bubbles but after thinking about it, it could be trash. I really dont know. I do know that it will come out if I rubb it out hard enough, but I feel that I will be hitting color real fast.
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Old 06-06-2003, 06:49 AM
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If you are taking of a lot of clear you should shoot a few more coats of clear just to be sure. I start with 1200 paper, then finish with 2000.

Recoat might depend on what kind of glaze or polish you are using.

Troy;
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Old 06-08-2003, 10:22 AM
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Sounds to me like moisture in the line from the compressor and the white residue is polish left in the small pits.

Kevin
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Old 06-08-2003, 03:45 PM
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I have to agree with Kevin. If they are bubbles and you wet sand them they will turn white from the powder that you create sanding. The bubbles are likely from moisture from the air source. If that sounds likeit came from experience, you're right! BEEN THERE, DONE THAT
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Old 06-11-2003, 07:32 AM
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Yeah; I`ve been there and that is very possable. If you recoat the clear be sure all the bubbles are sanded out Good Luck

Troy;

Last edited by troy-curt; 06-12-2003 at 09:58 AM.
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Old 06-12-2003, 09:03 AM
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Repair / Blend

Ok, then I need a good advice on blending metallic color. I went ahead and sanded half the fender with 400 grit and got most but not all the tiny bubbles out. I plan on just blending in the new paint by painting color and then clear over the bubbled paint job. Will this be ok? Is ther anything I need to be careful about when blending metallic colors? Thanks
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Old 06-12-2003, 09:57 AM
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You can`t hide the bubbles.
They have to be sanded out.
then reshoot the clear.
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