Excellent point Jim (a7dz). JimmyZ, another couple of items make me wonder if you followed the instructions. You mention, Since the instructions clearly state that the metal should be completely dry after degreasing and etching both, and to NOT let either substance dry on the metal (they both get rinsed off), even taking Florida sun into account...that's a mighty short window.You previously said Based on that, I would surmise that you thinned the POR with ...??... Even POR's instructions state to not thin it more than 5% per volume, and then using their special thinner which, from personal experience, is really still too thick to spray out of a standard bottom feed gun. Now supposing you used a gravity feed gun, your suggestion of 4-5 coats and comparing that with a "whopping 100 mils" tells me that at best each coat of yours topped out at ... 15 mils or so (and that's presuming you painted THICK). So at 30 mills (.030" or less than 1/32") of thinned and sprayed POR you then allowed water to pool...in Florida, with a presumed higher salinity to the rain than in Kansas or even 100 miles inland...and Even you mention I'll disagree with you regarding "being properly POR'ed", per your own commentary. It seems that if anything, you proved how well it works EVEN when you don't follow the directions AND you stack the deck against it. As far as Stainless Steel floor pans, you don't mention which grade of Stainless to use, nor where or how the average garage mechanic is going to procure the specific welding wire and flux gas for welding Stainless to Carbon Steel. Nor deal with the other problems and technical experience needed to do the job properly. Then you mention Does that mean you don't advocate a complete continuous weld because of the difficulty of fitting the repair piece? How do you propose to restore the strength back to the floor pan?Sorry, but that's just too many short cuts taken for me to give much weight to the rest of your advice. You've apparently had some experience, but you're apparently self taught. Nothing wrong with that, but it's easy to confuse an apparent lack of failure as being successful. Please don't misconstrue this as being a flame war, it is not. There are several of us here on this board that have worked on numerous vehicles over a range of years. You've done a lot of good work summarizing information, but please note that what you've posted on your site is only YOUR view, whereas here we've all contributed AND discussed. I strongly urge you to take advantage of the search engine here and do some reading of all the posts that precede your joining us. I think that you will benefit and hopefully will stick around and benefit US with your viewpoint. 2¢ Enrique