LA-CO Slic-tite® 41219 Paste with PTFE 8 fl oz - Specially formulated with PTFE for added sealing power, Slic-tite® is the premium thread sealant paste. It has been successfully used for decades to seal water, air, steam, natural gas, and more. It removes easily from skin and clothing, reducing post-job cleanup time. Slic-tite® thread sealant works in extremely high-pressure systems, and it comes with several approvals to ensure industry standards are met.