If built correctly a shower floor built over a mortar bed can be long lasting and reliable.
How to fix a shower floor.
This will help support the floor preventing future cracks.
For large holes in the floor of a tub or shower unit use an expanding foam product to fill the cavity below the floor.
Understand and fix your leaky tile shower pan to get rid of mildew mold and rotting wood.
However the complexity of the process can cause many issues down the road if several key steps are not properly executed.
Restore the floor with automobile polish.
Clean the fractured surface with a damp cloth dabbed in acetone.
Smooth the mud out and create a 1 4 inch slope per foot of shower floor space toward the drain.
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Buff off with a clean cloth.
Doing so will remove contaminants that will hamper your repair and prepare your fiberglass floor for the next step.
If your fiberglass shower floor is extremely dull or contains a lot of scratches you can try to restore it with white automobile polish.
A paste type kit works well for minor cracks.
After cleaning and drying the floor apply an automotive white polishing compound to the floor.
Use the product according to the directions on the can and trim or sand off any excess foam that is protruding about the finished surface.
If the crack is minor you may be able to repair it without incurring the cost of retiling the area.
Use a shower pan repair kit for a hole or crack in the shower floor or for a crack caused by lack of support between the wall and the shower surround.
Step 1 clean the cracked surface.
Apply bathtub repair paint to create a smooth well matched surface.
Below are the materials that you need along with the instructions on how to repair a fiberglass shower floor.