SM-350 SEALCOAT SKID 50 GALLON SAND PUMP SEALMATE designed sealcoat spray systems have been a proven industry standard for over 30 years. It’s simple, rugged built, and a powerful pumping system which provides the sealcoating professional with one of the most versatile spray solution available. Our pumps are built with fewer parts, nearly one third less than air diaphragm pumps, which makes them virtually maintenance free.