Silicone adhesive is resistant to chlorine and other chemicals, which makes it extremely useful in pool and spa applications. Waterproof sealant is the best fix option when pool foundations have cracks or damage. Sealant is easy to apply, and creates a waterproof and airtight seal. The sealant's tube application system allows for multiple uses and no wasted material to leak or fall when used. It is also able to mold unlike materials together, such as plastic to grout.