Serveon Sealants TP300 5G Travertine Professional Slip Reducing Sealer 5 Gallon. TP300 is the professional solution for reducing slipperiness and preventing/minimizing stains. TP300 is a penetrating, surface, and sub-surface impregnating molecular bonding treatment. It integrally waterproofs and preserves travertine of any age or finish while modifying the surface structure imparting stain and slip resistance.