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Originally Posted by Jaggu

Arka is right, am also looking for some ideas where by i can make the original floor panel water proof while installing these sheets. Maybe first a layer of 3M rubber sealant and ensure no gaps at the corners, etc etc.

Originally Posted by fazalaliadil

No method of applied sealant can keep moisture out, it may keep the water out, but not moisture which is the principal factor for floor corrosion.

The best is to leave the floor open to sky .

As pointed above, any and every method will trap moisture between the floor and the material and screw up the metal. I have experienced this with my gypsy when I had thermoed [also known as "namda"] the entire floor, firewall, roof etc to get a better cooling with my AC..

Now, My AC does NOT work and the floor is bare naked!