How do these mats deal with matter, does it absorb or can you simply wipe it off. If they aren't impermeable, is there something that you can treat the mats with to make them more impermeable.

Our 1" Sports Play Tiles will not absorb any matter. They will allow water and other liquids to pass through, but will not allow solid material to flow through. If these tiles were to be used in an area where animals may also play, we would recommend sealing the tiles with our Rubber Floor Finish and Sealer. This will help to make the tiles impervious to water and other liquids.