Deck-O Seal or Mastic is essentially the caulking between your pool decking and the coping (brick or stone) around the perimeter of your pool. The sealant acts as the expansion joint that expands and contracts during warm and cold weather. It is important to replace when it starts to crack or peel to prevent damage to the tile and coping of your pool.
Your swimming pool needs mastic because it prevents water from seeping in between your deck and pool. If water starts to leak behind your pool or even underneath your deck, in the worst case you may need to replace your entire deck.
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Deck O Seal can come in a variety of different colors.
Most common colors we see are tan, white and grey.