How do you seal a fiberglass and resin bird bath?

To seal a fiberglass and resin bird bath, first ensure the surface is clean and free of dust or debris. Apply a waterproof sealant specifically designed for fiberglass, using a brush or roller for even coverage. Allow the sealant to dry thoroughly as per the manufacturer's instructions, and consider applying a second coat for added protection. Finally, check for any missed spots and ensure the entire surface is sealed to prevent water leakage.