The BOSS® 801 Pool & Spa Silicone is a one part, low odor, neutral cure, mildew resistant, noncorrosive silicone adhesive/sealant. BOSS® 801 is designed specifically for hot tub and pool repairs and also works well on acrylic, fiberglass, ABS, PVC, wood and masonry. It also provides an excellent seal for spa jets and fittings.