Tiles add a decorative edge around the perimeter of the swimming pool. As the pool coping, these tiles rest on top of the pool's beam and its expansion joint. As the ground freezes and thaws with the seasons, it shifts and settles. The expansion joint and anything on top of it may shift and settle as well. Grout between the swimming pool tile eventually cracks or shows signs of wear because of these seasonal changes. Recaulking pool coping protects the swimming pool from weather-related damage.
Remove old caulking from between the pool coping tiles. Be careful not to damage the tiles as you scrape out the old caulking with a knife. Use a stiff brush to finish removing all the debris between each one of the tiles.
Scrub the surface of the tiles with a few drops of dish detergent mixed with water. Rinse well. If old caulking still remains, or if any foreign matter is adhering to the tiles, remove it with a single-edge razor blade. Re-rinse to remove the debris. Allow the tiles to dry.
Insert backer rod into the joints. This acts as a cushion and you don't need to use as much caulk.
Apply masking tape along the edges of each tile on the pool coping. Caulk each joint with pool caulking material. Some products allow you to apply them with a caulk gun, while others require you to apply them with a spatula. Smooth the caulking in place. Allow it to skim over for at least 48 hours before removing the masking tape. Caulking typically takes three to seven days to completely dry.