I have a suggestion: SEM Chip Guard. I have used this stuff quite a few times and it is really good. Available at any automotive paint supply.
http://www.google.com/products/catalog? ... CHIQ8gIwAQ
Two cans should be enough to do the whole floor inside if you dont hose it on too thick.
The best way I can describe it is that it is like spray-on ABS glue; even smells like it. It dries hard and can be top-coated if scuffed. Bond is excellent, as long as the surface is properly prepped. At bare minimum, everything should be cleaned thoroughly with wax/grease remover, then acetone, then scuffed with course (brown) scotch-brite until all gloss is gone. Preferably wet-sanded with ~220g, but the scotch brite is bare minimum.