To remove a polyurethane based sealer off of saltillo you will be required to use toxic paint strippers, a respirator and protective clothing. The easiest way to see.
I did find a good floor stripper at Home Depot (after spending $ on useless strippers and chemicals), but I had to use it at full strength.
Stripping Saltillo need not be a headache. At ICA, we have all of the chemicals, tools and equipment you could possibly need to strip and.
Welcome to the community; let's talk about getting your saltillo tile back on a lot not only on our tile aisle, but also in our paint department.