Step 1
Sand the area around the crack as far away as 1 inch.
Step 2
Drill a hole with your drill bit at either end of the crack to relieve stress and prevent it from opening further.
Step 3
Clean the area of the crack thoroughly to remove all dirt, grease and soap scum.
Step 4
Cut a fiberglass strip from your epoxy kit so that it is slightly larger than the crack.
Step 5
Mix the epoxy according to the directions on the package.
Step 6
Cover the crack and drill holes with half of the epoxy mix.
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Step 7
Apply the fiberglass patch over the crack and press into the epoxy mix.
Step 8
Coat the fiberglass patch with the other half of the epoxy mix. Smooth the mixture and taper the epoxy beyond the edges of the repair.
Step 9
Wait 20 minutes for the epoxy to dry and cure before using the bathtub or shower.