Things You Will Need
Bathtub liners cost about half of what a new tub will cost, and you can install one yourself given the right tools and instructions.
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Clean the bath rigorously with a lime scale remover. Check for any signs of rot. If you do not remove rot, it will spread throughout a wall that has been covered by a liner.
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Place butyl tape sealant and silicone adhesive in the tub according to the liner instructions. Follow the manufacturer’s guidelines carefully. Set the liner into place over the tub.
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Insert caulk into the caulk gun and seal all around the liner edges. This step will seal out moisture.
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Insert drain and overflow cover fixtures that come with the bathtub liner. These should line up with the holes in the original tub. Do not use the liner for a day in order to let the seal bond.