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Old 04-18-2010, 08:30 PM
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sanding clear then repaint with base clear agian questions

anything I need to look out for when doing this? do I need to sand all the old clear off of the car and go down to the original paint? or can I just sand the clear untill its smooth and then spray the paint right over the old clear? Im sanding the car right now, will spray it in the next 2 weeks, any other tips is much appreicated too, thanks alot.

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Old 04-19-2010, 06:28 AM
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Well I know for a fact that spraying base coat can wrinkle up the freshly sanded clear coat.

What happened that you need to sand down and start over?
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Old 04-19-2010, 07:45 AM
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Spraying base over "freshly sanded clearcoat" isn't going to wrinkle. What happens in some cases is the clear coat is sanded too much, making it too thin to create a barrier over the base. If it is too thin, or sanded thru, the solvents from the next application of base get thru and into the base under it lifting or wrinkling it.

DO NOT try to sand all the clear off, it is just the opposite, sand it well but don't go thru!

If you do sand the clear thru or real thin you need to be careful when applying the base as to not get it to wet.

Brian
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Old 04-19-2010, 07:48 AM
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I had an instance where base sprayed over sanded clear wrinkled. The old pro informed me that to avoid this that I first lay down a light coat of base and allow extra flash time before the next coat of base. I did and every thing worked out fine.

Vince
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Old 04-19-2010, 07:53 AM
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Quote:
Originally Posted by 302 Z28
I had an instance where base sprayed over sanded clear wrinkled. The old pro informed me that to avoid this that I first lay down a light coat of base and allow extra flash time before the next coat of base. I did and every thing worked out fine.

Vince
Vince, "Sanded clear" isn't any more susceptible to wrinkling than unsanded clear it isn't any "different", it is a "shell" over the the base.

Where it would be "different" is if it is uncured, or if it is sanded so thin that it stops being that "shell" and the solvent from the new base can get thru it. THAT is when it wrinkles, the act of sanding it isn't going to do it by it's self.

Brian
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Old 04-19-2010, 08:00 AM
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Quote:
Originally Posted by MARTINSR

Where it would be "different" is if it is uncured, or if it is sanded so thin that it stops being that "shell" and the solvent from the new base can get thru it. THAT is when it wrinkles, the act of sanding it isn't going to do it by it's self.

Brian
That is probably what happened, hence the suggestion to first lay a very light coat of base with an extended flash time between coats.

Vince
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Old 04-19-2010, 08:11 AM
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Im getting the impression this guy is talking about a vehicle with a previous paint job, most likely one that's been on the car for a while.
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Old 04-19-2010, 02:03 PM
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hey, thanks alot guys, I painted the car about 10 months ago, turned out o.k but am doing it over agian, the clear has been on the car for 10 months now, as well with the base coat, so both are fully cured, There is some edges on the fender where I sanded down into the old base and old primer, with the base being 10 months old, will the new base still cause the old base to wrinkle? Or does that only happen with fresh base?
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Old 04-20-2010, 07:09 AM
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I should have been clearer in my description, "freshly sprayed and freshly sanded clear coat can wrinkle under a wet application of base coat."
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