Apply a wax removing product to a rag. Wipe down the boat with the rag until all of the old wax and fiberglass sealant is gone.
Plug any holes or dents with epoxy putty. Allow the epoxy to dry. Sand any areas where you put epoxy until if feels smooth to the touch.
Apply a layer of paint primer that is made for fiberglass to the boat with a paint roller. (See Resources below.) Allow the boat to dry overnight.
Apply a paint made for fiberglass to the boat with a paint roller. Paint in one direction. Apply the paint so it is smooth.
Allow the paint to dry for at least an hour.
Apply another coat of paint.