Posted by CNKS on December 04, 2012 at 17:04:02 from (18.104.22.168):
In Reply to: Grit posted by David G on December 04, 2012 at 15:38:05:
I color sand and buff the last coat of urethane (1200-2000 grit) on sheet metal, but only to remove the "cooties" that I can't prevent from getting in the paint. Rims have enough roughness in them that you really need to mess up to have to sand them, the cooties are hard to find and blend in with the texture of the metal. Put on 3 normal coats of urethane with hardener with 5-15 minutes between coats, using the right reducer for the temperature and they will be nearly perfect. As Gordo says sanding between coats is reserved for lacquer, IMO the worlds worst paint. Also if you sand single stage urethane you can remove the clear in it which gives the UV protection, as it "floats" to the top. Since I usually have to sand, I use base-clear, which give a better finish and the ultimate in UV protection.
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