The Use & Necessity of Mastic

Pool Mastic. Almost every pool has it, nearly everyone sees it, but hardly anyone knows what it actually does.

While mastic can be a seemingly unnecessary part of your pool’s border, it isn’t just a pretty strip of caulking - it’s a crucial sealant that is used for many purposes, and has a great impact on the cost and overall long-term health of your pool.

So what’s it for?

The purpose of pool mastic - also known as a Urethane Sealant - is to provide a waterproof seal that prevents water & ice from penetrating behind the pool shell (pictured).

While pools are, of course, vessels for holding water, water is a powerful and destructive force that can cause a variety of problems for swimming pools. If water is allowed to seep anywhere it shouldn’t be, it can cause issues like:

• Soil erosion

• Pool shifting

• Deck shifting

• Calcium buildup

• Tile & Coping loosening

• Etc.

By using mastic to seal the gaps between the deck and coping, these issues can be prevented. Mastic creates a flexible seal which expands and contracts with changes in temperature & humidity, and ultimately keeps water from going where it shouldn’t be.

It's important to note that, although magical in many senses, pool mastic isn’t bulletproof. Over time it can break down due to exposure to sunlight, water, chemicals, and general wear & tear. Because of this, it's important to inspect the pool mastic periodically and replace it as needed (typically every 3-4 years).

In conclusion, pool mastic is a vital component of any swimming pool. By providing a waterproof seal between the pool deck and coping, it helps to prevent water damage and keep swimmers safe. If you're a pool owner, be sure to keep an eye on your pool mastic and replace it as necessary to ensure the longevity of your pool.

And if you need new mastic, we’ll take care of you 😎👍.