【How-to】What should i seal my picnic table with

The Best Silicone Sealant for Outdoor Use—DAP Adhesive Silicone Sealant. The DAP silicone sealant works equally well in indoor and outdoor applications. It is compatible with fiberglass, ceramic, rubber, porcelain, and other materials, and it forms a strong, mildew-resistant seal that lasts and does not break.