How to Seal a Concrete Pool

Written by joshua bailey
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How to Seal a Concrete Pool
(glasses on a swimming-pool edge image by Ivan Hafizov from

Concrete is a highly porous substance, and concrete pools and pool decks are always covered in water. When the water is absorbed, the concrete can begin to crumble over time. Water absorption may also cause discolouration and mildew growth. In order to prevent either of those things from happening, you need to seal the concrete.

Skill level:
Moderately Challenging

Things you need

  • Broom
  • Hose and water
  • Heavy duty gloves
  • Concrete sealer
  • Paint roller
  • Extension pole
  • Plastic tarp
  • Weights or bricks

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  1. 1

    Sweep away all loose dirt and debris, and then hose the area down to begin the job with a clean surface. Put on the gloves and prepare for some manual labour.

  2. 2

    Apply a thin layer of sealer to a large section of the concrete. It is best to work in sections so you have time to smooth over it without the risk of it clumping and drying too quickly. Waterproof sealant will add extra preventive measures against cracks, chipping and water absorbency. A penetrating sealer is best so it reaches below the concrete surface, sealing it from below along with above.

  3. 3

    Use the paint roller to roll the sealant back and forth, making it a very thin first layer. An extension rod can be used to ease the stress on you.

  4. 4

    Let the sealer dry for one full day, and then apply the second coat. In between applying sealer on separate days, lay the plastic tarp across the area, and hold it down with weights or bricks. This will help the sealer dry without letting moisture and dirt in.

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