400 sanding scratches

S

Steves69LS3

hey guys ive done body work with SPI epoxy and high build block sanded starting from 120 and finished with 400 i am using PPG deltron tuxedo black base coat. it states to mix 1:1 with reducer. after about 1 light coat followed by 2 medium coats should i still be able to see the 400 sanding marks? still should i add more coats? or should i strip it and final sand with a higher grit?

thanks for your time!!
 
Did you seal it before painting? I know I always seal with epoxy 1:1:1 so that help fill some of the scratches. Also with metallics I will wet sand with 600 before sealing and laying color. Just my method, doesnt mean it is right.

So I basically didnt answer anything for you here! lol sorry.
 
nope didnt seal it. i only have white epoxy and would have rather sealed it with black. its no biggie its only paint it can be removed and put back lol plus i have to sand out some trash in the base anyways
 
You dont need to strip it. Just wet sand with some 600 and clean everything up good then give it a couple more coats of color. Next time get a quart of gray spi epoxy and use a thin coat as a sealer. Lot less head aches.
 
should i under reduce the next coats of color? say 1:.5 instead of 1:1?
 
I never do I just do a normal paint. Some times I'll add a hardner to my base coat. Spi universal hardner works fine at about 10%.Let base dry at least 4hrs. before clear coating.
 
Its not uncommon to see sanding scratches as you speak of in your base. they will disappear when you spray the clear.. I would put on a nice wet 3rd coat of base and go to town.,.But that is just me.. Its black, you are not going to have scratches showing after the cut and buff even if you had scratches that would show.. Plus sanding the base is messy and unnecessary.. If in doubt still after my reply, call Barry!
 
Yeah, if it's Ford Tuxedo Black, the scratches might show in the topcoat. If we are not sealing a base-clear job, we will use 600, or even 800 in the case of some brands of base that are thinner bodied.

The last complete we did got blocked with 400, guide coated and re-blocked with 600.
 
thanks for the replies everyone. i still need to sand to get some junk out. it is gm tuxedo black PPG they call it lamp black non metallic. i should have enough to respray i only bought a pint :)
 
GM's tuxedo black was from the 60's if I remember right, has a fair amount of blue tint in it. Are you shooting a complete car?-a pint = 1 quart of sprayable and probably won't get you all the way around the car?
 
If all your painting is a spoiler I would just sand it as smooth as I could get it with 600 wet, clean with wax and grease remover. Then re-spray it and clear coat.
 
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