Ready to use highly elastic one component sealing compound the silicone based heat resistant coltogum sealing compound is perfect for a wide range of applications like automotive and machine repair its elasticity and heat resistance make it ideal for sealing and water proofing ducts chimmneys funaces fireplaces and more features thermostable heat resistant up to 300 c short term 350 c thermo resistance from 60 c to 350 c skin formation approx10 minutes