What grit before spraying epoxy 1:1:1

A

adrynalinjunkie

OK guys I have all my 2k reg build flat with 320 (I dry sanded with AFS sanders)

I am just nervous that one slick coat of spi epoxy mixed 1:1:1 as a sealer won't fill all the 320 scratches.

I have get screwed before with 400 grit wet sanding 2k and then spraying base.

I always wet sand to 600 when spraying base over 2K with no sealer.

Are you guys sure 320 scratches will fill with one coat of spi epoxy mixed 1:1:1 ?

Should I dry block with some 400 or 500 just in case?
 
I always go with 500-600 no matter what. Never has luck with 320. Scared to spray my sealer that heavy and wet.
 
If I do spend the weekend going over the car with 500 or 600.

should I just do it dry sanding with the AFS sanders, or should I wet sand?

Anybody else?
 
wet or dry is a personal preference, I like wet for grits that fine, some use an interface pad on a DA to step it down from 320 to 500 or 600. Shooting the sealer over 320 isn't a problem with solid colors but with metalics I almost always final sand with 600.
 
Yeah, the key thing about your question is to know what color you are spraying. Fine, light colored metallics in particular will show scratches very well.
 
adrynalinjunkie;18673 said:
should I just do it dry sanding with the AFS sanders, or should I wet sand?
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I would stay away from the AFS sanders at this point, assuming all your leveling and blocking is done. I would wet sand with 600 wet and a soft backing pad. You're not trying to level anymore, just get a nice smooth surface with 600 scratches for the base to hang on to. I know the preferred method is to spray the sealer like you first coat of base, but I just haven't gotten comfortable with that process yet.
 
Arrowhead;18936 said:
I would stay away from the AFS sanders at this point, assuming all your leveling and blocking is done. I would wet sand with 600 wet and a soft backing pad. You're not trying to level anymore, just get a nice smooth surface with 600 scratches for the base to hang on to. I know the preferred method is to spray the sealer like you first coat of base, but I just haven't gotten comfortable with that process yet.
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I agree. Everything should be flat at this point. Just use a soft pad and it shouldnt take that long.

I have sprayed sealer over 320. The only problem I've had was running the epoxy sealer. It is really easy to run until you get the hang of it. If you are looking for a learning experience, you could spray a coat of 1:1:1 epoxy right over the 320 and the sand it wet with 600. This will give you an idea of how well it fills the scratches and also some pracctice at spraying it when its reduced so much. When you spray your sealer when it really matters, you will be good to go and have no chance of missed scratches.
 
Bob Hollinshead;18674 said:
wet or dry is a personal preference, I like wet for grits that fine, some use an interface pad on a DA to step it down from 320 to 500 or 600. Shooting the sealer over 320 isn't a problem with solid colors but with metalics I almost always final sand with 600.
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That is damn tempting to try the da with 500. This wet sanding by hand is too hard of work! Lol
 
I actually like the final wet sanding by hand because it helps me pay closer attention to every square inch of the car. Besides that last time I tried the DA with 3000 I still managed to burn through an edge. :(
 
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