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Seal up leaks and prevent unwanted air flow with Thumb-Tite self-adhesive caulking compound! Our white sealing and caulking compound is perfect for HVAC applications like sealing ductwork and other surfaces. This non-staining, non-hardening compound creates a watertight, vapor-proof seal that won't dry out or crack, ensuring efficient operation. Plus, it's easy to use - simply press into place on any clean, dry surface. Ideal for both indoor and outdoor use, Thumb-Tite caulking compound is the reliable choice for professional sealing and caulking needs.