Surface Preparation
All surfaces  must be clean, dry, structurally sound and free from dirt, dust, curing agents or form releasing agents, efflorescence, scale and other contaminants prior to application.  Degrades, deteriorated or unsound surfaces shall be repaired or replaced.  All loosely adhering paint or coating shall be completely removed by scraping, pressure washing, blasting or other mechanical means.  Chalky, oxidized or other contaminated surfaces must be washed with United Cleaning Concentrate (UCC) or equal biodegradable cleaner.

All pits, gouges, knotholes and other depressions in wood substrates shall be filled and leveled using exterior grade wood putty.  Application of United's Primer 707 will provide stain-blocking and adhesion to bare wood substrates. MARATHON CWS may be applied directly to properly prepared concrete, masonry or brick surfaces.  Concrete, masonry or stucco surfaces that are delaminated and/or spalled shall be repaired prior to application of the sealer.  All cracks larger than hairline shall be considered as "moving" and shall be routed and caulked.

Prior to application over masonry block or other porous and/or textured surfaces, Block Filler 704 or other approved acrylic block filler must be utilized to fill the pores and achieve a pinhole-free surface.