How to Fix Hairline Crack in Plastic Tub | Rings World ...
Clean your plastic bathtub as you normally would, and let dry for 24 hours. Inspect closely for cracks and other forms of damage. Locate and mark the crack/s to spot easily. Once you have located the crack/s, drill a ¼-inch hole on each side of each crack. Gently sand the crack using 120-grit sandpaper. Do not sand abrasively as this would ...