Your goal is to easily scuff the surface area to some degree to allow for greater adhesion from the plywood or SAC. Once you sand, utilize a tack cloth to wash the dust in the area then clean all the things with a few warm, soapy drinking water. Tack fabric http://prbookmarkingwebsites.com/story5033960/the-smart-trick-of-new-look-kitchen-refacing-in-rochester-that-nobody-is-discussing