A fiberglass lap pool that is tiled having tiles popping off and needs to be retiled what should used so the do not pop again?

1. Surface Cleaning: Properly clean the fiberglass pool surface to eliminate any dirt, grease, or debris that could affect the adhesion of the new tiles. Use a mild detergent and a soft brush to clean the surface. Rinse thoroughly with water to remove any residue.

2. Fiberglass Repair: Repair any cracks or damage on the fiberglass surface before applying new tiles. Use a high-quality fiberglass repair kit to patch any holes or damage and allow the repair material to cure according to the manufacturer's instructions.

Tiling Materials:

1. Backer Board: Install a backer board over the fiberglass surface. This will provide a stable and even surface for the tiles to adhere to. Choose a backer board specifically designed for use in swimming pool applications, such as a cement board or a fiberglass-reinforced backer board.

2. Thin-Set Mortar: Use a high-quality thin-set mortar specifically formulated for fiberglass pools. This type of mortar is more flexible than traditional mortar, which helps prevent cracking or popping of tiles due to thermal expansion and contraction of the fiberglass surface.

3. Tiles: Select tiles that are suitable for swimming pool applications. Porcelain or ceramic tiles with a water absorption rate of less than 0.5% are recommended. Avoid tiles with a high glaze, as they may become slippery when wet.

Application:

1. Laying Tiles: Apply a layer of thin-set mortar to the back of each tile and press it firmly onto the backer board, ensuring that it is level and aligned with the surrounding tiles.

2. Grouting: Once the tiles are set, apply a grout specifically designed for swimming pools. Fill the joints between the tiles completely and remove excess grout with a damp sponge.

3. Sealing: After the grout has fully cured, apply a penetrating sealer to the tiles and grout. This will help protect the tiles from moisture and staining.

Tips for Prevention:

1. Proper Bonding: Ensure that the fiberglass surface is properly cleaned, repaired, and coated with a bonding agent to ensure a strong adhesion between the backer board and the fiberglass.

2. Expansion Joints: Install expansion joints in the tile installation to allow for movement and prevent cracking or popping of tiles due to temperature changes.

3. Quality Materials: Use high-quality materials, including backer board, thin-set mortar, grout, and tiles, that are specifically designed for swimming pool applications.

4. Professional Installation: If you're not experienced in pool tiling, consider hiring a professional pool contractor to ensure proper installation and prevent future issues.