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1st wipe the area with a per body work cleaner like RM's 900 then sand the area with a 220 grit paper and feather back the OE finish that is around the bare metal area .blow the area off with a air blower and wipe it down again with the 900 and then spray your EP primer over the bare metal using no more that two medium coats (more E-type primers are not better it's worse ) .
then if you still see any rust pits you want gone you would want to fill them with a product like USC's Icing # 26006 . primers are not for the most part good for filling pin holes and rust pits . it will sink in over time and you will see them again down the road .
then after you sand the icing you will have some more bare metal spots . you will then want to spray more EP primer over the bare metal spots .
next after the ep primer slashes ( dryes a little but not to cure ) you would want to spray a filler type primer over the ep primer . just 2 or 3 coats should do ?
most but not all ep primer you can not just top coat you would need to spray primer or a sealer over it or it will peal .
you then can sand it area again with a 600 to 400 grit paper wipe it down with a pre paint cleaner clean the area real good . then tack it off using a tack rag and top coat with the 22 line . if you have any brake thrus thru the primer to the metal , icing or the old OE finish that is when you would want to use a sealer . one reason a sealer is use is to give a even surface so you will not see any rings ( AKA ass holes ) from the brake thrus later on after the new top coats are sprayed .
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