Mod Podge by Plaid:Craft is an all in one sealer, glue and finish.  It is perfect for sealing your EVA foam as well as wood, fabrics and other porous materials.  Mod Podge is quick, easy to use and dries clear.  It is non-toxic and can be cleaned up easily with soap and water.

It comes in many varieties such as gloss, matte, and fabric