How to Seal a Wood Hot Tub

Combine 1 cup of heavy-duty wood cleaner in a bucket with a gallon of warm water. Put on rubber gloves and dip a scrub brush in the mixture.

Scrub down the outside of the hot tub thoroughly, removing any dust or dirt. Rinse it off with a steady stream of water from the garden hose. Allow it to dry for two full days.

Attach a piece of 80-grit sandpaper to the bottom of an electric sander. Run the sander across the surface area of the wood frame of the hot tub. Do this once more with a piece of 220-grit sandpaper.

Run a handheld vacuum cleaner across the surface area of the hot tub frame, sucking up all the dust from sanding.

Dip a 3-inch nylon brush in your heavy-duty sealant. Your sealant must be designed for protecting wood from regular water contact, UV rays and mildew. Cover the wood in a generous coat and allow it to dry overnight. Apply three more coats, allowing them to each dry overnight before applying the next coat.