Can an insert be fitted into any old bathtub?

No. If the shape is non-standard, the shell is deformed or dimensions do not match, the method may not be suitable.

Does an insert hide old chips and stains?

Yes, because it creates a new inner surface, but only if the old base remains stable enough underneath.

Usually yes. The drain and overflow zone is critical, and a quality result normally requires careful reassembly there.

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Acrylic insert bathtub restoration in Israel — when it works | KABLAY