What is a liquid Spray System? A Roofing system applied with a high efficient airless sprayer that discharges a thick rubber or silicone membrane that immediately dries air tight on the roof sealing all cracks and opening in one complete esthetic layer with no seams. Liquid Spray systems can be applied on any type of existing roof or applied to a new roof. This roof system is ideal for a larger surfaces, building, warehouse or industrial buildings.