OLYMPIC 56162, 561620 OLYMPIC WATER GUARD Tinted Waterproofing Sealant for Wood GENERAL SURFACE PREPARATION Proper surface preparation is essential for the OLYMPIC limited warranty to apply. All surfaces must be clan and free of dirt, dust, off, mildew, and loves material. Previous coatings must be completely removed. Prior to sealant application, clean weathered, dirty or mildewed surfaces with OLYMPIC Deck Cleaner. After rinsing, ensure surface is free of standing water.