If you want epoxy or polyurethane to last, the substrate has to be right. That starts with concrete grinding Sydney to remove contaminants, open the surface, and create a profile that coatings can actually grab onto. Why Surface Prep Makes or Breaks a Floor Epoxy and polyurethane don't fail because the product is "bad." They fail because they can't bond. Dust, curing compounds, paint overspray, oil, and laitance act like Teflon. Grinding removes ...