How to Repair Cracks in a Fiberglass Tub

Many bathtubs today are made from fiberglass. Although this material is strong and long-lasting, over time it may begin to develop some cracks. Even the smallest hairline cracks need to be addressed right away because eventually they will begin to spread. The good news is that this is an issue that is easy enough to repair. It begins by heading down to your local hardware or home supply store to purchase a basic fiberglass repair kit. Then you'll want to follow these additional steps to complete the job.

1. Make Sure the Crack is Clean.

Use a sponge to clean out the entire area around the crack. Any normal household cleaner will be suitable for this step. The sponge will help you get the cleaner into the crack. In a pinch, vinegar may also work.


2. Sand the Bathtub Around the Crack.

Using a fine grit sandpaper, sand around the area of the crack. Make sure to brush away any dust or debris that is left with your sponge. This sanding is necessary so that repair kit bonding agents can be used.

3. Paint the Hairline Crack.

Fiberglass repair kits have bonding agents that must be applied to the hairline crack. Allow the bonding agents to dry according to the instructions that are on the repair kit.


4. Use a Putty Filler.

Once the bonding agent has dried, you can apply the fiberglass putty filler that came with your repair kit. It is easier to use a small plastic putty knife for this job. Press the putty into the crack and then scrape of the excess putty with the knife. Allow the putty to dry.

5. Make the Repair Flush.

You'll need to make the repair flush with the surface of the tub. Brush away any dust and then apply the epoxy gel coat around the crack. Place a fiberglass cloth repair patch over the gel coat and flatten with your putty knife to remove air bubbles. Then apply a second gel coat, allow to dry, and finish the repair with the finish coat or sealer. A fiberglass tub can look good as new when you know how to repair a crack in it. Use these steps and you'll be able to finish this repair in no time at all.

Posted on Mar 10, 2015


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