Automobile Primer for Armor

I use Krylon gray and red oxide auto primer, works great. I've also started using Krylon "camo" colors, intended to hose your ranch truck or deer stand, but they cover great and dry without getting grainy.

The M50 I'm doing right now was primed with Krylon.

I use halfords auto primer both regular and plastic. Both work fine and polish up well too.

I agree.  The cheapo stuff works fine for plastic and resin.

I have two AB's. But using spray cans for priming seems more convenient.

If you have an a/b, try Vallejo Polyurethane Primer, good stuff, will take gentle wet sanding, but not major rough stuff.

Car-type Acrylic primers in rattle cans with Lacquer/Cellulose thinner have 'bite' & will stick where it's sprayed, esp. if unintentionaly oversprayed!

This is what I use whenever I DO use a primer.

$1.00 - 1.25 at Walmart in all kinds of gloss & flat colors

I have used Krylon indoor/outdoor primer with good results. I have used red and grey colors. The red needed to be coated with dull coat to keep it from rubbing off though.