This is amazing! There’s bath fitter over our beautiful 1950s tub which I am sure is blue (like the toilet and sink) and I desperately want to uncover it!
The liner can leak at the 3 seams as well as those cracks. I also own a reglazing business and was called to a customer for an issue with their liner. Turned out water had seeped behind, you could hear it swishing all around between the liner and tub. There had to be gallons of water trapped.