Blue Max® White is a strong and highly adhesive elastomeric liquid rubber waterproofer with 900% elongation that moves with the surface to resist cracking & peeling. Blue Max® is ideal for waterproofing above & below grade foundations, basements, roofs, floors & more. Commonly used on masonry, cement backer board, ICF, wood, concrete, metal & more. When Blue Max is used on any roofing substrate, it is important to topcoat with either our Maximum Stretch or Ames Premium Roof Armor to protect it from the sun's UV rays.