Life Caulk vs. Life Seal – (Which Should Be Used)

Regarding home improvement projects, there are many different sealants on the market that can help you get the job done. Life caulk and Life Seal are two of the most popular products for this purpose. 

While Life Seal and Life Caulk are often used interchangeably, there are significant differences in their elasticity and water-resistance capabilities. In general, Life Seal offers more elasticity and water resistance compared to Life Caulk. 

In this post, I’ll break down the differences between Life Caulk and Life Seal and help you decide which one is right based on your requirements. Let’s get started.

silicone sealant

What Are the Differences Between Life Seal and Life Caulk?

Life Seal and Life Caulk are sealant products from BoatLIFE that are designed to bond to various materials, like wood and fiberglass. Most people, even professionals, use these sealants interchangeably, but this should be avoided as each product is specially created for certain needs and to work with different materials.

Whether you need a sealant for your DIY home project or any other activity, here are the pros and cons of each product to help you choose the right one.

Life Seal


  • Life Seal is a more durable and flexible product.
  • It has a high-temperature range.
  • It does not need to be applied multiple times.
  • Life Seal is water resistant.
  • Life Seal does not shrink.
  • Has a powerful adhesive capability.
  • Perfect to be used on fiberglass.
  • It cures quickly.
  • Can be painted.
  • Can be sanded.


  • Life Seal can be challenging to work with.
  • Life Seal may not provide as good of a seal as Life Caulk in certain situations.
  • Hard to clean.

Life Caulk


  • Life Caulk is an easier product to work with.
  • It provides a neat seal in most situations.
  • Powerful adhesive for wood, a common building material.
  • Easy to clean.
  • Can be painted.
  • Can be sanded.


  • Life Caulk is less water resistant than Life Seal.
  • Life Caulk may need to be applied more than once in certain conditions.
  • More likely to shrink when cured.
  • Life Caulk is more rigid.
  • Takes longer to cure.

Life Caulk vs. Life Seal: Choosing the Right One

applying sealant

When it comes to choosing a suitable sealant for your needs, there are many factors to consider. Some of the most important include flexibility, water resistance, and ease of use.

Life Seal Is the Best Overall Choice

If you need a sealant that is highly flexible and water-resistant, Life Seal is your best bet. It can be used on many different materials, including:

  • Wood
  • Fiberglass
  • Metal
  • Rubber
  • Plastic

Generally, Life Seal is formulated for use on fiberglass but works well with nearly any material.

Ideal For Areas With Extreme Temperature Changes

Another factor that makes Life Seal the best overall is its high-temperature range, which makes it suitable for home projects in most locations. And if you have an outdoor project, it’s best to use Life Seal. 

areas with extreme temperature

The adhesive is also the ideal choice in areas with frequent weather changes.

The extreme resilience of Life Seal also makes it useful in areas of your house that experience frequent temperature changes, like the kitchen, and also in places with humidity issues, such as the bathroom. With Life Seal, you won’t have to worry about the expansion or contraction of the sealant damaging the airtight bond.

Perfect For Water-Prone Areas

Silicone, a significant component in Life Seal, makes it more water resistant than Life Caulk. If your project involves a water-prone area such as the roof, Life Seal is the ideal option as it has higher adhesion and is resistant to water.

Effective for Urgent Projects

If you want a sealant that will cure quickly, Life Seal is your go-to product. Unlike Life Caulk which may take up to 10 days, Life Seal cures in 24-36 hours, which makes it perfect for working on an urgent project with a tight timeline. 

In addition, it also cures well underwater.

The biggest caveat with Life Seal is that it can be messy to work with, which can be attributed to the silicone component. Life Seal is mucky, and you must be extra diligent to ensure a clean seal.

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Life Caulk Is Ideal for Certain Projects

While Life Caulk doesn’t have the same flexibility and water resistance as Life Seal, it can be ideal for specific situations.

It’s Best for Projects Involving Wooden Parts

If your project involves wooden parts such as a deck or structural beams, Life Caulk is your best bet. The adhesive properties of this sealant are perfect for wood, and when it dries, it creates an additional layer that strengthens the bond.

Life Caulk Provides a Clean Seal

The other advantage of Life Caulk is that it gives a clean, smooth seal. Unlike Life Seal, which can leave messy globs, Life Caulk doesn’t leave a residue when it dries. It’s also easy to clean up in case your project starts to get messy. 

Life Caulk is the perfect choice if you’re working in an area where you need to maintain aesthetics.

As mentioned, Life Caulk is also not hard to clean, so if you make a mess, you can quickly clear it and continue working. This factor can save time and prevent additional hassles, especially when you’re working on a large project.

preparing fitting sealing

However, there are some drawbacks to using Life Caulk. It may take multiple applications to achieve an effective seal, and it’s less water resistant than Life Seal. So if you’re working on a project that will be exposed to the elements, Life Seal is usually a better option.

Life Seal and Life Caulk Can Be Sanded and Painted

If your only criterion is a sealant that can be sanded and painted, you can use either Life Seal or Life Caulk since both can be used this way. In fact, paint bonds with a surface more effectively with either sealant, making them excellent for projects requiring waterproofing and aesthetic appeal.

The video below gives tips and tricks on how to seal like a pro:

Final Thoughts

Overall, both Life Seal and Life Caulk are excellent products that can help you with various home-improvement projects. They are durable, versatile, and can be sanded or painted.

If you’re working on an outdoor project where temperature fluctuations or water exposure is a concern, I recommend choosing Life Seal.