Our sealing mastic contains polydimethyl-siloxane, polyurethane. It can efficiently seal cracks, strong and durable, with professional caulking effect. Its use is simple: open the package and take out the sealant. Clean the gaps that need to be sealed to ensure that there is no dust, water, debris and other debris. Fill the cement into the gap to a depth of 3-5 cm to ensure even filling. Wipe the surface with your hand or a tool to keep it smooth with the surrounding area. And strong adhesion, suitable for a variety of material surfaces, to ensure long-term stability.