This is how we prepare all of our epoxy garage floor concrete surfaces! It is the best method, as acid etching is bad for the environment, and over all not a great method to open the pores of the concrete surface! We use diamond grinders with vacuums to assure a perfectly prepared surface for your epoxy garage floor surface! We can even remove old worn out, lower quality epoxies that havnt held up over the years! For our floors we only use the highest quality epoxies and we offer a lifetime warranty on our clear coat against peeling, fading, or delamination! Call or visit our website! 480-382-9690 or www.PrecisionGarageWorks.com