Epoxy Primer

I've been painting for 15 years and I have'nt come across it. Usually epoxy primer is 2-part(primer+hardener) so I could'nt see how it could be put into a can. Quality primer can run you 15.00 to 30.00 each rattle can. You would be better off buying qts. or gallons. 15.00 for a Harbor Freight spray gun. IMPORTANT- Any time you have bare metal you need to use a ETCHING primer, its slightly acidic and will etch itself to metal surfaces, otherwise it might flake. Available in rattle cans. Good luck