Will Flex Seal Fix a Cracked Bathtub – All You Need to Know 

will flex seal fix a cracked bathtub

A cracked bathtub ruins the shower experience by posing threats and risks from various angles. There are different ways to resolve such an aching issue, among which the usage of flex seal is popular. Will flex seal fix a cracked bathtub? 

Yes and NO – depending on the circumstance. 

Confusing and want a detailed explanation? Stick around.

As we get into the article, we will walk you through everything you need to know about getting your bathtub fixed if you consider flex seal as the solution. 

Let us get the ball rolling. 

What Causes a Bathtub to Crack? 

Before we discuss how we can fix and mask the crack in a bathtub, we need to find out and learn the causes to avoid repeating the mistake in the future or allowing such mistakes to happen. 

Let us take you through the possible causes of cracks and dents in bathtubs. 

  • Unstable Stance 

Do you notice your bathtub being unstable and wobbling? Do NOT turn a blind eye, thinking it is not deep. 

It can result in your bathtub being in cracks which you do not want. Instability in the bathtub floor is a sign of cracks in the near future. 

Act fast and use expanding foam or something similar underneath the tub to shove off the issue before it takes shape. 

  • Harsh Cleaning Agents 

Harsh cleaning agents can be another culprit for cracks on bathtubs. 

Most cleaning products contain several harsh chemicals that can harm the tub. 

Continual abrasion against the tub with harsh products can weaken its external finishing layer and make it more prone to damage. 

Be careful when choosing cleaning products. Do not only consider how well they will clean the surface. Also, consider if the chemical content is safe for the tub surface. 

  • Heavy Falls

Heavy hits on the tub surface are another major cause of cracks in bathtubs. 

Take care of your bathtub and handle it with care. Do not smash and throw heavy things on the tub. 

Does Flex Seal Work on Cracks? 

Yes, flex seal is renowned for fixing various types of cracks on different surfaces. 

Flex seal creates a water-resistant and tight seal between cracks and safely holds it for extensive periods. Your money and effort are saved. 

Flex seal is an excellent alternative for fixing cracks and dents. 

How long does Flex Seal lastIt depends on the subject surface. Depending on it, the time durations of its life expectancy may vary. 

Is Flex Seal a Permanent Repair? 

No, flex seal is NOT a permanent repairing solution for cracks. 

It is a temporary solution. 

But obviously, if the crack is tiny, it may act permanently. What if the cracks are not so tiny? In that case, it will only serve as a temporary fix. 

Will Flex Seal Fix a Cracked Bathtub? 

Yes and NO. 

Hear us out. 

Flex seal can work on certain bathtub cracks, but it won’t work on other bathtubs. It depends on the tub’s material. 

If you use a fiberglass bathtub, a flex seal will work well. But if you are using a porcelain or ceramic bathtub, a flex seal will not work. 

The flex seal’s ability to fix and sit on porcelain and ceramic surfaces is fragile. It will not adhere to the surface at all. So it is of no use. 

It works on the contrary in fiberglass surfaces. Flex seal on fiberglass can work really well. It will fix and sit on the surface by holistically covering the cracks. 

How Long does Flex Seal Last Once Applied? 

Not for long. 

Flex seal can only be used as a temporary solution to fix cracks. 

How long is that ‘temporary’ period, you may ask? Well, it depends on the intensity at which the bathtub is exposed to factors that will weaken the seal. 

Since the bathtub is always in a wet environment and is constantly in contact with water, the seal will not withstand for much time. 

What Else Can I Use to Fix Cracked Bathtub? 

There are also various other effective options to fix a cracked bathtub in addition to using a flex seal. 

Let us skim through such options we have in the subject. 

  • Repair Kit 

Using a repair kit is a convenient and cheap option you have in this context. 

You can purchase a bathtub repair kit from just about any hardware store. 

And the repairing process is also straightforward. You can do it yourself instead of requiring a plumber. 

However, a repair kit does not work well on metal and ceramic bathtubs. Take that into a note before making your decision. 

  • Epoxy Resin 

Using epoxy resin can be an effective option if your bathtub isn’t fiberglass. 

However, you shouldn’t mind getting messy since it can get messy during work. 

Epoxy resin is very flexible and binds well to many items, including bathtubs. It is also durable, so it is worth the work. 

Let us quickly go through the steps to apply epoxy resin to a bathtub. 

  1. Clean the crack with water and soap to remove any debris and grime. 
  2. Use a suitable tool and fill up the cracks with resin. 
  3. Allow the glue to completely dry. (Do not use the bathtub until the resin is fully dry, which usually takes about 24 hours) 
  • Water Weld 

Water weld I an epoxy putty, and it can work well in fixing cracks on different surfaces, including bathtub surfaces. 

Once you apply the putty correctly, it will take approximately an hour or more, depending on the damage size, to fully cure. 

Since it is resistant to water and moisture, it can work effectively on bathtubs. 

  • Stabilizing Primer 

A stabilizing primer will not necessarily fix bathtub cracks. But it will stop the cracks from growing further and buy time for you to resolve the issue before it gets any bigger. 


Flex seal can work effectively in fixing cracks in bathtubs. However, it doesn’t work on porcelain and ceramic tubs. Moreover, flex seal can only be used temporarily to fix cracks. 

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