Will this product make my rubber mats waterproof again? If not, is there something that will?

Rubber flooring is water-resistant, not necessarily waterproof. Our Rubber Floor Finish and Sealer will help to fill in any pores in your flooring to help make it more water-resistant. If you have multiple rolls or tiles where there are seams, we recommend using our seam sealer glue as well to help make your flooring more water-resistant.