Jim I wouldn't do the job it will probably end up spotty at best, unless I was going to colorseal over the excisting colorseal and then only particular colorseal products. I have been asked many times by excisting large commercial customers to remove Saniglaze and re-colorseal it and won't touch it if it's a whole floor. I have done areas of removal of Saniglaze and it was a son of a gun. Had to use Jabco and it is strong stuff dual gloves and if you get any on the glove you can feel the burn.
If I can help in any way feel free to pm me or call and I could maybe give you some helpful tips/info