Sand high build primeer to 600 before expoxy seal coat or 320?

Arrowhead

Arrowhead

Oldtimer
I'm starting to close in on this TBird. I'm getting pretty close to being ready to shoot epoxy sealer. Should I take the high build primer all the way to 600 before epoxy or is 320 OK? I won't be painting right away so I had planned on wet sanding the epoxy w/ 600 before base anyway.

If I have minor sand throughs on the high build primer, will the epoxy seal coat be sufficient to cover them?
 
Depends on the break throughs. I had a few on the mustang, some problem places went down to the poly. I spot those areas in with epoxy first, then applied a full wet coat after 30-45 min flash at avg 75 degrees. Come in next day and spray base.

I wetsand final 2k app. with 400. Even if color is metallic. Very fine fine metallic/pearls will get a once over the 400 with some 500-600. Epoxy as sealer, then base. If you are planning on scuffing the epoxy before base, i'd use 600. Seems like the epoxy would still be too soft the next day to hit with something as coarse as 320-400.
 
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Arrow I always stop sanding 2k primer at 320.. Then I will over reduce epoxy and use as my sealer.. Never had any issue's doing it that way.. Also saves allot of unnecessary sanding and time on your part stepping all the way up to 600..

For the ultimate job, stop at 320.. then spray epoxy reduced 20%,, let set overnight and wet sand next day with 600.. That is how Barry suggest show work be done..

If you are trying to avoid that sanding, then do as I suggested.. stop at 320 and use epoxy reduced as your sealer.. It will fill in the 320 scratches and also give your base the best thing to bite into in my opinion..

I like mixing my epoxy 1:1 and reducing with 50% appropriate urethane temp reducer.. Spraying 1 wet coat and letting set for 30-60 minutes, then you can directly base over it or single stage over it..

Happy spraying ;)
 
I sand down to 320 and then buzz over it with 500 on an interface pad and DA. Spots I can't da I sand down to 400 and call it good. I've noticed a difference when I stop at 320. Even with epoxy sealer I seem to see the 320 sand scratches in metallics and the clear seems to die back easier showing the light scratches.
 
Bondoking;4902 said:
Arrow I always stop sanding 2k primer at 320.. Then I will over reduce epoxy and use as my sealer.. Never had any issue's doing it that way.. Also saves allot of unnecessary sanding and time on your part stepping all the way up to 600..

For the ultimate job, stop at 320.. then spray epoxy reduced 20%,, let set overnight and wet sand next day with 600.. That is how Barry suggest show work be done..

If you are trying to avoid that sanding, then do as I suggested.. stop at 320 and use epoxy reduced as your sealer.. It will fill in the 320 scratches and also give your base the best thing to bite into in my opinion..

I like mixing my epoxy 1:1 and reducing with 50% appropriate urethane temp reducer.. Spraying 1 wet coat and letting set for 30-60 minutes, then you can directly base over it or single stage over it..

Happy spraying ;)
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So after you spray the reduced coat and wet sand with 600 do you base then or spray another sealer coat?
 
Brad J.;4910 said:
I've noticed a difference when I stop at 320. Even with epoxy sealer I seem to see the 320 sand scratches in metallics and the clear seems to die back easier showing the light scratches.
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I agree, I've often seen 320 scratches come back on light metalic jobs-sometimes takes 2-4 weeks for them to show up. Solid colors-no problem. If it's a metalic I apply guidecoat after the 320 sanding and sand it again with 600-it takes very little time to take it this extra step. After the 600 I give it a good rub down with a grey scotchbright. Some people may put their epoxy sealer on thicker than others-this may be what causes the differences in results, I like a very thin coat.
 
Panel Wagon, after I wet sand an epoxy sealer coat with 600 I spray base over the 600.. There is no need for another shot of sealer at this point.. You can spray whatever you like over this. Solid colors, metallics, singles stages..

In my opinion, adding more sealer over top of the sanded sealer will not create any benefit and you are only adding more solvents and mil thickness..

However

If you wet sand your sealer and let it set for more than say 3 -4 days in heated garage or especially summer temps.., then I WOULD shoot one 50% reduced coat of epoxy slick as a sealer and base 30 minutes later..
 
Alright, somehow along the lines I got confused but I got it now....its been a rough day.
 
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