Another update
Got back to working on the Bronco this weekend and tried using "Frost King" on the vertical portions of the tub instead of "Peel and Seal" with poor results. The Frost King wouldn't stick to the Lizard Skin I sprayed on the tub like the Peel and Seal does - in fact, the Frost King feel off of the Lizard Skin. Every time we applied the Frost King, it detached and fell off.
So, at least for my project, Frost King is a no-go! I am sticking (pun intended) with Peel and Seal.