Caulk caps seal a half-used tube by blocking air and moisture at the nozzle so the remaining material stays usable.

For silicone and latex caulk tubes start by wiping the nozzle clean of wet beads and cured crust with a paper towel and, for silicone, use a small dab of mineral spirits on the towel only if needed to remove residue. Choose a rubber or silicone cap sized to fit snugly over the nozzle and push it on until it compresses slightly; a proper fit creates an airtight barrier and prevents skinning. For cut nozzles keep the cap over the tip and store the tube upright with the nozzle pointing up to reduce pressure that forces material into the cap. If reusing the cap repeatedly rinse it after each use to remove buildup and let it dry before replacing it to avoid contaminating the caulk. For very long pauses wrap a short length of clean plastic wrap around the nozzle before capping to add a secondary seal and slow solvent exchange for silicone types. Label the tube with the date and type of material so you can rotate stock and avoid long-term degradation without relying on memory.

Three common mistakes are fitting a cap over a dirty nozzle which causes leaks and contamination so always clean the tip first; using a cap that is too loose which allows air ingress so test fit caps and choose a smaller size or one with an internal rib for better grip; and storing tubes lying on their side which lets caulk settle into the cap and makes removal messy so store tubes upright with the nozzle up and remove any excess from the cap after storage.

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