Best coating for frame rust protection

Put a piece of tape over the number, and coat/paint away.

Leave the tape there, only remove it if you need to someday in the future.

 

I use 50/50 epoxy primer on everything now. Go to bare metal with a fairly rough grit (80 - 100) for good mechanical adhesion, shoot the bare metal with laquer thinner out of a gun to clean it, coat with epoxy as soon as it's dry and it won't matter what you put on for a top coat. I top coated my frame with $20 tractor enamel and don't have a spot of rust over 5yrs later.

 

im glad my jeep spent its life in california. the factory frame coating is still in great shape and im just going to leave it alone.
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If you guys really want an awesome, spray in bedliner that works for frames, floors, everything...check out tcpglobal.com for U-POL raptor bedliner. It's a two-part spray on stuff that is as thick as Rhino lining and just as durable. It's 120.00 for the kit, which you get a spray gun, four bottles and hardner. The stuff is seriously legit. They also make a tintable version. I've used it on my boat deck, and the entire inside of my jeep tub with awesome results.