Application Instruction Overview for Westcoat WP-43

IMPORTANT! Before You Begin: Review the complete Westcoat WP-43 Technical Data Sheet (TDS) and Safety Data Sheet (SDS), linked above, before installation. The information below is a brief overview and does not replace Westcoat’s complete application instructions.

STEP 1 — INSPECT AND PREPARE THE SUBSTRATE

• Surface must be clean, dry and free of grease, paint, oil, dust and other material that could prevent proper adhesion
• Nails and screws must be flush with the surface
• Plywood should be clean and dry, typically defined as less than a 10% moisture reading or showing no moisture with a plastic sheeting test
• Concrete must be cured for a minimum of 28 days and scraped or ground to remove protrusions
• Pre-patch divots or holes as needed

STEP 2 — APPLY WP-43

• Apply WP-43 by brush or roller
• Apply evenly without leaving puddles
• Prime the entire surface to be waterproofed
• Prime only as much surface as can be covered with sheet membrane within 4 hours

STEP 3 — ALLOW PRIMER TO BECOME TACKY

• Do not cover wet primer
• Allow WP-43 to become tacky before installing the sheet membrane

STEP 4 — INSTALL SHEET MEMBRANE

• Apply WP-40 Sheet Membrane within 1 – 4 hours after priming
• Re-prime areas that fall outside the application window

INSTALLATION LIMITATIONS

• Primer must be covered the same day
• Do not apply over wet surfaces
• Do not cover wet primer
• Do not allow Westcoat products to freeze