Hey Denny, you have a very good plan there but I would do the underside before the final paint on the truck (speaking from experience here) because of the mess that 3-m undercoat or Mar-Hyde makes during application.

As careful as you can be won't be careful enough and no use to risk a high dollar paint job due to sequence of procedure.

The epoxy primer will for sure keep any rust from forming and will bond well to any of the rubberized undercoatings. Best of luck.Hobert


"The Lord is my shepherd"