How to Repair a Fiberglass Tub or Shower
Fiberglass showers and bathtubs are durable, easily maintained, and attractive
fixtures, but they may still be accidentally damaged. Fortunately for homeowners,
there are inexpensive kits available that can be used to make repairs if this happens.
1. Purchase a suitable kit for your shower (or bath tub). You should make sure
your shower or bath tub is fiberglass before going shopping, as these instructions
will not give good results on cast iron or other types of fixtures.
• Make sure your shower is fiberglass by tapping
it with your knuckle or a wooden spoon or similar item which will not damage the finish.
A fiberglass unit will have a soft, hollow, non-metallic sound, and depending on where
you tap it, may even seem flexible.
• Choose the appropriate color for the kit you
will purchase. Most kits come with colorants (tinting products) to change the color of
the product to match common colored fixtures, such as white, off white, or almond.
• Make sure the kit you buy comes complete with
everything you need, or purchase these materials and tools seperately. The following is
a list of what your kit may contain:
• Polyesther resin
• Hardener (catalyst to harden the resin)
• Fiberglass mesh or mat (for large or structural repairs)
• Sandpaper in assorted grits, from 80 grit (coarse) to 400 or 440 grit (very fine)
• Thickener (to stiffen the resin for vertical applications)
• Protective gloves resistant to the chemicals included in the kit
• A mixing container and stirring tool
2. Clean the area to be repaired. Cut any jagged or protruding glass fibers around the
damaged area, sand it lightly with a medium grit sandpaper to remove wax, oil, soap scum,
or other surface contaminants, and rinse with acetone or another solvent to assure proper
adhesion of the repair product.
3. Determine if the damaged area will require fiberglass cloth reinforcing. If it
does not, skip to the step describing mixing and tinting instructions. If the crack
is over one fourth of an inch (1/2 cm) wide, or is actually an open hole that the
resin mixture will not fill alone, cut a piece of fiberglass mesh or cloth slightly
larger than the hole. For large holes or cracks, more than one layer of cloth may be
needed to get good results.