Nope. Been there, done that.
I finally got the wrong coating off the floors, and side walls, and rockers, and front foot panels...
I tested some POR15 on a small area and was not impressed. It went on like water, too thin.
Instead, since the metal was so clean now, I chose to coat the entire floor area with a PPG epoxy coating. (I've used it before) Goes on thick and fills all the seams. I got a semi-rigid seam sealer down and coated over that. I have to now re-tap all my bolt holes because the epoxy got in the threads. Half done with that. I'll get some pics tonight.