Neutral Cure Silicone – Safe for use on metal, plastic, tile, and masonry surfaces Waterproof & Chemical Resistant – Formulated for long-term use in pools and spas Flexible & Durable – Won’t crack, shrink, or degrade in wet or high-temperature environments Easy to Apply – Fits standard caulking guns for precise application Seal and protect with confidence using Boss 801 Pool & Spa Neutral Cure Gray Silicone Adhesive. Specially designed for high-moisture environments, this premium-grade silicone is ideal for pools, spas, hot tubs, and other wet-area sealing applications. Its neutral cure formula provides superior adhesion to a wide variety of surfaces without causing corrosion or staining on sensitive materials such as metal or stone. Boss 801 remains permanently flexible and resistant to cracking, shrinking, and discoloration — even when exposed to constant water, chemicals, and extreme temperatures. Whether you're performing new installations or repairs, this 10.3 oz cartridge offers professional-grade performance you can trust.