Sand with 600, wet or dry?

T

tinnocker

I have sprayed about 3 coats of SPI 2k primer and will block sand with 220 and then it needs to be sanded with 600 for my metallic base. Will dry sanding with 600 be just as good as wet sanding or will wet sanding leave a smoother finish and not show sanding scratches as bad? I am going to shoot a thinned coat of SPI epoxy before the base. Does the epoxy also need to be sanded with 600, wet or dry?
Thanks
 
Wet or dry is personal preference, though they make different styles of sandpaper for each method. Best to use the method that matches the sandpaper.
 
If the reduced epoxy is still in the recoat window you don't have to sand just go to color.
 
220 to 600 is a big step imo. It would be easy to miss some scratches that would show. I would use 320 or 400 first. Guide coat would be a good idea too.
 
Bondoskimmer;23106 said:
If the reduced epoxy is still in the recoat window you don't have to sand just go to color.
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I was reading the PPJ (perfect paint job) last night and IIRC it had two options after sealer:

Seal with reduced epoxy 2hours later base (no sanding?) or
Wait overnight and sand 400-800 then shoot base.

Bondo Skimmer are you saying we have 7days shoot base after sealer? That would be great for me because I only get a few hours a day to play with this stuff.
 
Guidecoat is a requirement if you're resanding with a finer grit and want to make sure all the prior grit scratches are gone.
 
I don't wait 7 days to shoot without scuffing. Too long IMO. After a day or two I would scuff. When shooting poly primer (off subject sorry) over epoxy I let epoxy sit over nite then scuff with maroon scotchbrite, blow off, tack cloth, shoot poly.
 
I've found that spraying in my home made garage booth, that I get some nibs in the epoxy when I use it as a sealer. Scotch brite pads do a fine job of ruffing up the surface, but don't seem to cut down the nibs in epoxy very well. So I "like" to wet sand the epoxy so it's nice and nib free. Since the epoxy is sandable, makes sense to to me to start spraying base on a smooth a surface as possible.
 
Arrowhead;23226 said:
I've found that spraying in my home made garage booth, that I get some nibs in the epoxy when I use it as a sealer. Scotch brite pads do a fine job of ruffing up the surface, but don't seem to cut down the nibs in epoxy very well. So I "like" to wet sand the epoxy so it's nice and nib free. Since the epoxy is sandable, makes sense to to me to start spraying base on a smooth a surface as possible.
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Arrowhead,

I've been reading on sanding and majority say to wet sand with either 400 or 600. What grit do you wetsand with?

Thanks!
 
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