You are currently viewing How to Fix a Crack in a Fiberglass Tub- A DIY Method to Fix any Crack.

How to Fix a Crack in a Fiberglass Tub- A DIY Method to Fix any Crack.

Most contemporary houses benefit from modernized work and materials, comprising fiberglass or acrylic bathtubs instead of conventional porcelain-coated cast iron or stainless steel. Inexpensive, appealing, and sturdy, fiberglass is susceptible to cracking and pitting in the end. Luckily, restoring a cracked or dented tub or shower pan is an uncomplicated DIY task that generally homeowners can do to spare themselves cash over a costly alternative. This article of “how to fix a crack in a fiberglass tub” covers the basics for restoring on the most widespread issue – fiberglass tub fix.


How to Fix a Crack in a Fiberglass Tub?

Bathtub Cracks Types:

Stress crack: -Stress cracks develop when a strong piece is by accident plunged in your bathtub. Usually, these types of cracks are shallow and are simple to repair; go to your closest home recovery department store and buy an economical repair kit, and you can fix these types of fractures yourself.

 Hairline cracks: Hairline cracks form when constant use and misuse is put on the material, producing small cracks in the end that ultimately can damage the reliability of your bathtub itself. Unlike stress cracks, there are fundamental repair kits that can cover your bathtub before propagating and causing any additional destruction. Stress is set on the stuff, and it starts to change over time due to lack of backing.

Read our another article what is an alcove bathtub.

What Causes Bathtub Cracks:

There are three principal causes why cracks tend to develop in, bathtub materials which is lack of support or if the material is supple, destruction from heavy objects, and damage from harsh cleansers. Certain material such as fiberglass is extremely flexible, implying it will bow if the load is placed on it. 

If this kind of material is fitted inappropriately or without extra support, the stress pressure will eventually produce cracks. Cracks also are likely form when objects are accidentally plunged on the bathtub, forming small clods and dents that will finally turn out into much greater cracks and gaps. 

Finally, with extremely harsh cleaners such as bleach, the bathtub’s polish and luster can be weathered away, letting more dampness into the material, producing cracks. So why are cracks threatening? Well, if overlooked, even small cracks in your bathtub can ultimately become much bigger cracks overtime.


Repairing Cost:

Although it will differ on the service provider and the skill associated with it, normally contractors and plumbers will charge anything from $ 80 to $ 150 an hour varying on their disciplines. As you can understand, this is pretty expensive for repairing your bathtub. Nevertheless, with a little volume of study and relatively inexpensive repair kits, several of these cracks can be accomplished for less than $50 to follow our article “how to fix a crack in a fiberglass tub.”

Tools and Materials Required:

To get to your restoration easy and tension-free, consider a comprehensive kit that has all that is necessary to resolve most problems. Nominally the kit should include:

  • Liquid hardener
  • Polyester resin/epoxy in putty or paste form
  • Sandpaper of various grits
  • Mixing stick and tray or mat
  • Protective gloves
  • Colorants for common tub hues (i.e., almond, off-white), if needed.
  • Finishing polish


For greater cracks and holes, it may as well be essential to acquire fiberglass mesh to strengthen the putty and make it less likely to dent. By the rule, use mesh for any crack broader than one fourth-inch or an open cavity that is too big to fill in with the resin mixture only. More widespread problems caused by inappropriate installation and support may involve drilling surface holes in the tub, sealing those holes with two-part foam, and combining fiberglass patches before applying polish.

Bathtub Repairing Kit:

On the marketplace, readily available are two regular repair kits-surface repair kits and internal repair kits. Surface repair kits typically come in the manner of a polymer-based tape or paint that will wrap up the crack on your bathtub’s exterior surface. Internal repair kits normally are glue or paste that will pile up in the gaps from the interior. 

Together these bathtub repairing kit are pretty self-descriptive and economical, normally competing on regular $ 30-$ 40 each, offering an inexpensive and simple option to employing specialized support.

Step by Step guide for fixing Bathtub Cracks:

Sealing a minor hole or crack in fiberglass is an uncomplicated procedure through our DIY guide on “how to fix a crack in a fiberglass tub?”; however, you should set in reserve an entire day to permit time for the mixture to solidify between steps. For this purpose, this is a great assignment to commence in the morning and conclude throughout the day, among other home development ventures. Follow the step by step guide given below:


  1. Organize the area – at the beginning, cleanse the area with a household cleaner and a sponge. Use rubbing alcohol, acetone, or a similar solvent efficient enough in removing oils, soap scum, and glass fibers.


  1. Drill as Required – When an absence of support is the cause of the trouble, you need to tackle it head-on. As an Alternative of eliminating the tub and restoring the support structure, drill six to eight small holes in the tub and add foam. If you aren’t doing on the basic support, but you’re fixing a crack, use a gyratory tool with 80-grit sandpaper to grind a bevel about 1 1/2 inches thick centered on the flaw.


  1. Add Two-Component Foam – For additional support, infuse two-component foam into the gaps that you drilled. It solidifies in a little time and builds a robust base.


  1. Apply a Patch – If utilizing fiberglass mesh, lay it around the crack or hole according to measurement, and then trim it so that it is marginally larger than the break it is to conceal. Additional layers may be needed for exceptionally deep holes.


  1. Mix the Filler –Wearing protective gloves, blend the resin putty and hardener as instructed by your repair kit, adding pigment if working on a colored tub. Use the supplied mixing stick and tray and put it atop a piece of scrap cardboard to avoid accidental leaks onto permeable bathroom surfaces.


  1. Repair the Crack, Chip, or Hole – Instantly circulate the blend into the break or hole, or on top of the fiberglass mesh. Take attention to work it in completely to make it into all gaps and avert depression. Don’t be scared to heap the mixture over the hole to fill it in entirely; you will be polishing it later.


  1. Allow the Mixture to Set – Allow the mixture to establish up in the gap for 2-3 hours or longer for larger, deeper holes. When set, use the sandpaper to flatten the surface gently. That may well take a little time and elbow grease.



  1. Refinish the Surface – Use the finishing polish to finish the patch up and improve the melding into the tub.


Varying on the magnitude of the destruction, our article on “how to fix a crack in a fiberglass tub” is a straightforward DIY plan. If you choose to DIY this repair, make sure you allocate yourself enough time to let the epoxy and other materials used in the repair become dry in the middle of steps. Moreover, contemplate wrapping the area outside the surface. You’re in work with cellophane tape to avoid the refinishing materials from stretching over the undamaged part of the tub.

If you speculate that the flaw or cavity has produced water destruction in the subfloor, or if the plan deems like it’s more than you want to take on, employ a specialist to do the work for you.

Leave a Reply