I'd start a savings account for a new bath tub.
I had this done myself on one tub.
The original old bath faucet began to leak. That was a trick to find the tiny rubber gasket that was causing the drip. No, the local hardware store did not have gasket. Nor did plumbing wholesalers. I did find one but took much research.
It works. But the fan the installer used captured dust particles in air and ended up on tub surface.
As for your tub. You will have to find an installer to obtain a professional opinion if this stuff can be sprayed again. Not the best solution.
Just get a large rubber bath mat to cover the bottom of tub.
And begin to add to that savings account for a new tub. And of course a new fixture.
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