It is confusing. You don't always need to use sealer in all applications. A lot of silvers & gray metallics will pickup sand scratches easily, even 400 grit. Sometimes it takes a lot of paint to cover those scratches, the sealer will eliminate that. Sometimes the paint just lays down better with sealer. We sand everything with 400 dry, although wet sanding is the proper way to go, dry sanding is faster & a little less messier. I think you will find more wet sanding done in a restoration shop than in a production shop, & I think more production shops use sealers than restoration shops.
On uniform base, yes you are correct, but that's not always the case. Say your'e doing an overall & half the truck is in primer & the rest is just paint sanded with 400. This is where the sealer comes in. One coat over everything, let it flash, then color. Now you can have even color coverage instead of one area covering faster than another. There are a lot of colors that dont like to cover too good.
Hope this helps
Last edited by JeffL; 05/20/2010 3:26 AM.
