Undercoating a blessing or curse????

[1970pelle]

I have been gathering parts and different types of paints needed to detail my engine compartment on my 86 C10.The prior owner had at one time long ago had the truck sprayed with undercoating.I mean everywhere.They drilled holes all over the cab.Plugged of course.But it may be easier to replace the frt. inner fenders than try and clean them.The fire wall is over a 1/4 thick in places.Its great having a rust free truck.But man.And There really in no trying to paint over it and it look good.I have looked at the hammered finish paints and wrinkle.But I want a nice semi gloss compartment.Anybody have tips.This also gives a reason to post pics