[mongocanfly]

When you say the fenders are ruff, are you talking about the feel of the surface or damage done by the blasting ?...
If they've been sandblasted then you def need epoxy on the bare metal after all the rust is removed..
Then take care of any body work that needs adressed..i like the evercoat line of body filler...then your higbuild..then when it's to your satisfaction, paint..
It may be hard to get new paint to match old..keep that in mind...
Dont use parts store paint...it took 3 times but I learned my lesson about that
I'm using sherwin William's auto motive on mine...using single stage...I'm happy with the results..
Make sure you have a good regulator at the gun
You'll need several size tips for the gun...1.7 for primers and 1.3 for paint is what I'm using
I've had operator errors to overcome on mine, but I'm satisfied.