Posted by MO8N4ME on December 07, 2012 at 08:20:48 from (220.127.116.11):
In Reply to: Grit posted by David G on December 04, 2012 at 15:38:05:
@RTR, You might want to try using 400 grit before your topcoat. It should help your gloss retention. 320 is a little too coarse unless you are hardblocking out imperfections in your metal or primer and you are going to recoat.
Acrylic enamel has less viscosity than the synthetics and can open up your sand scratches a little. You probably won't see it with your eye, but it kills gloss retention. Also the Acrylic enamel reducer has a little more bite than the older synthetic enamel reducer. That bite from the reducer can also react on larger sand scratches.
If you are using urethane you should be using 400 or even 600 as a final sand or you might see sand scratches in your base under your clearcoat. .02
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