Cool Caulking Around Outdoor Light Fixture Ideas. The caulk helps to protect the fixture from weather damage and also seals any gaps that may allow moisture or insects to enter. It is mineral spirit based (meaning not water based) rubber like caulking so it will adhere to almost anything, it is flexible so it expands and contracts with temperature differences, and once dry, it.

Helping prevent damage and mold. It also suggests an easy way to waterproof outdoor lights by applying an extra silicon seal during installation. Smooth out any excess sealant using your finger or a putty knife.