Swimming Pool Epoxy Putty, Adhesive & Lubricant

A reliable pool sealant and adhesive is an essential part of any pool maintenance kit. Whether you're sealing a crack in the pool shell, repairing a fitting joint, or patching around fittings while the pool is full, having the right waterproof compound on hand saves you from expensive service calls and extended downtime. PST Pool Supplies carries Underwater Magic — a professional-grade aquatic sealant trusted by pool technicians and homeowners alike.

Underwater Magic is formulated specifically for pool and marine environments: it bonds and seals underwater without draining, resists chlorinated water, saltwater, UV exposure, and extreme temperatures (-40°C to +90°C). Available in five colors — black, gray, tan, blue, and white — it matches virtually any pool surface for a clean, nearly invisible repair. The elastomeric formula fills gaps up to 40mm, making it suitable for cracks, fitting interfaces, and expansion joints. It's non-silicone, odor-free, and safe for pool water chemistry when fully cured. Individual 290ml tubes cover single repairs, while the 12-count bulk packs are ideal for service professionals and ongoing maintenance programs. For tips on pool repair best practices, see Pool Magazine's maintenance resource center. Also browse our pool maintenance tools and supplies for a complete repair toolkit.

Note: Underwater Magic is not compatible with vinyl pool surfaces. For vinyl pool repairs, browse our pool liner collection for appropriate patching solutions. For all other pool shell and fitting applications — plaster, fiberglass, concrete, and gunite — Underwater Magic provides a durable, professional-quality seal that outlasts standard silicone caulks in aquatic environments. The NSF's pool water quality guidelines recommend regular inspection of fittings and seals as part of a safe pool maintenance routine.

Shop pool adhesives and sealants — keep Underwater Magic on hand for fast, effective repairs that hold up all season long.