Or, remove the grout and replace with an epoxy grout...if you like the looks of the tile, but don't want to deal with grout failures, replace it with epoxy. the inserts sometimes will leak and then you get a squishy mess between the old tub and the liner. If they work, they can be okay. My parents did theirs...I'm not thrilled with it, but it was fast. Not really all that inexpensive, though.