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i used rustoleum COAL TAR epoxy primer. Its a two part epoxy that mixes like molasses. I sprayed it but you can only spray it with a pressure pot gun and a .086 or larger gun orifice. In the future i think i will just brush it on, on the other hand it is impossible to get all the nooks and crannys of the frame unless you spray.
Its a steel ship primer rated for salt water immersion
You know i sort of ed up when i assembled everything, i should really have used sealant between everything i bolted to the frame to keep the water and or road salt out. I will probably pull the bed off again this summer and seal it up, sounds like a lot of work but honestly its just 8 bolts, disconnect the wiring, and lift with a chainfall.