Cracks in a shower or bath tub can be dangerous to anyone in the home. The crack can scratch someone's foot or cause someone to slip and fall. The crack will spread if not treated.
Sand the crack in the tub with 400 grit sandpaper. Sand approximately 1/2 inch around the crack. This helps the epoxy seal to the edges of the crack.
Drill holes at each end of the crack. Use the drill and 1/8-inch drill bit to drill the holes. This prevents the crack from spreading out into the rest of the tub.
Wash the area with dish soap and water. Use two drops of dish soap per cup of water. This removes any grit left over from the sanding. Let air dry or dry with a blow drier.
Mix the epoxy solution to manufacturer's specifications.
Apply the epoxy to the crack using the applicator. Completely cover the crack, drill holes and sanded area. Remove any excess epoxy with the applicator.
Let the epoxy dry for approximately 12 hours. Sand down the epoxy with a 240 grit sand paper that has been moistened. Rinse it off with soap and water again.
Apply the enamel gel according to manufacturer's instructions. Allow it to dry.