How to Fix a Cracked Shower Base

Before you can repair the crack, you need to assess the extent of the damage. Clean the shower base using shower cleaner and a clean cloth. While the crack may only be in one small area, clean the entire base so the damage can’t hide. Dry the base or let it air dry.

This is where you need to decide whether to tackle the crack yourself or call a local plumber to check for deeper damage. Note that cracks that are already leaking should be inspected by a pro. Water damage under the base can lead to expensive repairs. Pros should also check your shower if the base flexes, moves, or feels unstable when you step in the shower, as these types of issues could indicate deeper structural damage.

If the crack or chip is superficial, you should now clean the crack and the surrounding area with isopropyl alcohol to remove any remaining dirt, debris, or residue. Let the area completely dry before proceeding.

Use the fine-grit sandpaper included in the bathtub repair kit to sand the crack and the immediate surrounding area. You’re creating a surface to which the patch and/or epoxy can adhere.

Not all repair kits have resin, but for those that do, you’ll need to mix the resin according to the manufacturer’s instructions before proceeding to the next step. Put on a mask and gloves, and open windows and doors to promote ventilation in the bathroom. Use a putty knife to mix the resin.

If the kit contains a patch, use a utility knife to cut the patch to fit the crack with a 2-inch allowance on all sides.

Apply the resin or putty (whichever is included in the kit) to the crack with a putty knife or spatula. If you applied a patch, apply the resin or putty over the patch, making sure to cover the entire patch.

Let the resin, putty, or resin-covered patch cure. The manufacturer's instructions should specify the curing time, which is typically three to four hours. However, the final result is often stronger if the products can cure overnight.

Put on gloves and a mask to prevent breathing in the fine dust that this step may create. Be gentle, and use a fine-grit sandpaper to smooth the repaired surface. You don’t want to scuff the area outside the repair. You’re just smoothing the surface to match the rest of the shower base.

Use a clean cloth to apply the finishing polish included in the kit. The polish will help the repaired area blend with the rest of the shower base.

Wipe down the area with a clean, dry cloth to remove any remaining dust and debris.