wahoo wrote:So I put my filler on bare metal before epoxy, how high of a grit do I have to sand to before I epoxy over it?

Cut it flat by block sanding with P80. Then go over it again with P180 on a block to feather the filler out and remove the P80 scratches.
Now you can spray your epoxy. 2 coats for bare metal, 1 or 2 coats for filler.

Can you confirm this is the correct grit progression?

EPOXY
P80 - strip paint / bare metal prep for epoxy
"red" scuff pad - prep for filler/primer in contoured areas
P180 - existing paint prep for epoxy / prep for filler/primer (if epoxy has sat for 7+days) /

2K URETHANE PRIMER
P180 - initial primer block sand
P320 - block sand primer
P400 / Red Scuff pad - prep for sealer

SEALER
P600 - prep for basecoat

BASE COAT
NA

CLEARCOAT
P1500 - wet sand clearcoat
P2000 - wet sand clearcoat

Also some some specific questions:
1) Should I add an interim step to my primer block sanding (e.g. P220)?
2) At what grit should I move to a wet/dry paper (P400 or 600)?
3) Which will I use the most of? In other words, which should I purchase in bulk rolls vs sheets?
4) Besides 80 grit, what else should I get for my DA or Random Orbit (RO) sander? Which steps would you use a RO on?
5) My RO has a 5-inch pad, should I upgrade to a 6-inch? PSA or hook & loop?
6) Favorite blocking boards/tools?

I usually shoot my sealer and base coat wet on wet and do not sand the sealer.

gpracer15.... What are you using for sealer?