Workhorse tearing the old floor out was horrible. I used a plasma cutter, this put off some god awful fumes. So I replaced the floor first, I layed down a 2" weld about every foot. I then added the supports underneath. Same idea with the welds. Underneath I por15 all the metal then seam sealed everything. After this dried I roughed it up then Raptor lined. Same inside the tub. Etch primed, Hi-build prime, I let the final paint overspray inside the tub, seam sealed then raptor lined. To do it right its several involved steps. I feel I did it the best way possible. Hope this helps