Need help with prep work

I would rub it down using a long block,like 18''till you can just see base showing tru. then reprime

and guide coat it and rub again with long block .

Is that crazing in old paint? if so rub it till it's clear.or it will break thru down the line.

240-320 dry rub before priming,after priming 320-400 grit.

I like dry  rub.no water toblow out when you paint.

first coat I'd use a epoxy primer.it sticks well.then regular hibuild primer.

if you need to rub the epoxy,dont leave it too long as it dries very hard.

how far are you taking  it? are you top coating too?