Bathtub liners are designed to fit over your existing bathtub and walls. Typically made out of vinyl or molded plastic and can be installed in a day. However, the cost of the liner versus the bathtub refinishing is about $1300 for the bathtub and $3000 if you include the wall surround. The average bathtub refinishing project is around $350. Bathtub refinishing can  save 70% vs the cost of a new liner. 

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A poorly installed bathtub liner can end up being a headache for you later on. Bathtub liners tend to leak at the joints and drains, trapping water between the liner, and the old tub. This creates a waterbed effect leading to potential mold growth, which can be hazardous to your family's health.