Bare Metal? Which is best? DTM, Epoxy, Urethane, self etch primer, sealer?

1 Quart (0.95 Liter) Can of Custom GRAY Shop Premium Self-Etching Acid Etch Primer. Gray primer color. It etches and primes bare, rust-free metal in

Custom Shop Premium Gray Self Etching Primer, 1 Quart - Ready to Spray Paint, Excellent Adhesion to Bare Metal, Steel, Aluminum, Fiberglass - Use on

Transtar 2K Self-Etching Primer

Auto bodywork and Paint on Bare Metal, Single Stage Repair, When

Preparing Bare Steel and Spraying Epoxy Primer - The Resto Shed

Universal Paints - Red Oxide Metal Primer

Transtar 2K Epoxy Primer/Sealer, DTM

Sem Products 39681 Self Etching Primer Gray for sale online

Bare Metal? Which Is Best? DTM, Epoxy, Urethane, Self Etch, 45% OFF

Car-Rep 2K Primer Review. Is this the best spray can epoxy primer!?

Custom Shop Gray DTM High Build Urethane Primer Surfacer (Direct to Metal) 2.1 Voc, 1-1/4 Quart Kit - Fast Dry High-Performance Primer - Automotive