I bought some POR-15 in about 1998 for a Chevelle Project that I sold off. I still have a full can of the POR-15, Tie Coat Primer and Chassis Black as well as a partial can of POR-15. I just poured a little out of the partial can (I used sht metal screws to create a vent and a pour spout so little if any air would get into the paint when I first used it back in 98-99) It poured just like I remembered and using an acid brush I painted a section ot the rectangular tubing the rear floor support frame is made out of on my 48 Willys jeep project. It flowed out just like I remembered. So I want to use this stuff between the frame and the floor sheet metal as a Rust barrier. A photo of the frame and floor The wood strips are just so I can see how the Oak strips will lay out. Basically the floor is a flat sheet of 16ga with the sides of the pass side tool box welded to it. The white in this photo is the Tool box lid. If my test of the POR-15 sets up can anyone (aside from POR-15 bias) think of a reason I couldn't use it on top of the frame and the corresponding area on the underside of the floor to prevent rust. I am planning on seaming the seams after the floor is pop riveted down and then applying an epoxy coating followed by Kirker Primer and paint. The POR-15 will not be under the epoxy primer as I will mask off its application to just the area between the two layers.