[hinoonaz]

Prep is the most important part of any floor epoxy or stain. Diamond grind is the only way to guarantee on an older floor. I too had half new and other half 50 years old. Used Sherwin Williams epoxy (not the kit they sell now and water base) with an diluted first coat and then final coat. It is two part and can get it mixed to just about any color you want. It is not water based. I did not drive on for at least 2 weeks to make sure. Tires do not leave brown marks or anything. When it does rain here it just needs to be dry mopped and looks good. Expensive yet it does great. Has been down almost five years and not one spot of lift or discoloration. Mops up very easy. Again, the prep is most important. I like the idea of black and white checker tile, but the epoxy is easier to keep clean IMO.
Gary