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I had rusted floor pans with holes so i decided to try the inexpensive and less labor route. I used the silver POR-15 because their website says it has metal filler. I bought a pint from the local body shop supply store along with the metal ready solution. I hit the floor pans with a wire wheel and vacuumed it all. I prepped it with metal ready and then i brushed on the por-15. I bought some fiberglass mat from lowes or advance auto (cant remember) and layed down 2 sheets on the area with the holes. I brushed it with POR-15 until it soaked it all up. Also, i placed a large piece of cardboard on the driveway under the floorpans as not to stain driveway
. I let it set for a week before i looked at it. I tested it out by standing on the floor pans (i weigh 160lbs) and i didnt fall through. Its holding up pretty good, all i have to do now is paint the floor to match.
I would give it a shot, keep in mind i had quarter size holes and pinholes that are now filled.