To strip the sealer off of Saltillo tiles you should apply the stripper solution on to the tiles and allow it to dwell there. It can take a while for the stripper to work at softening up and breaking down the sealer. In many cases it can take an hour or more for the stripper to break down and soften the sealer on the tiles. An extremely aggressive scrub pad should then be used to scrub away the loosened up sealer and remove it. For large Saltillo floors a floor machine over an aggressive black pad can be used to remove the softened up sealer.
It is important to not let the stripper dry on the surface of the tiles. Keep adding stripper as required to ensure that it does not dry on the tiles. Use the aggressive scrub pads to scrub away the loosened up sealer until it has all been removed. Extract away all the broken down sealer and thoroughly rinse the excess stripper off of the tiles. Allow the tiles to thoroughly dry before re sealing them.