LOCTITE Waterproof Sealant 2.7-fl oz Gel All Purpose Waterproof, Quick Dry, Flexible Multipurpose Adhesive in the Multipurpose Adhesive department at Lowes.com
Mod Podge 12oz Clear Acrylic Sealer Gloss : Target
Castin' Craft Resin Spray & Sealer finish coat seal resin casting gloss spray craft clear plastic : TAP Plastics