Products : Flooring Installation Systems : Priming : CP-WE Polymer-Modified Water-Based Epoxy Primer

CP-WE Polymer-Modified Water-Based Epoxy Primer


CP-WE is a polymer-modified water-based epoxy primer and sealer that prepares non-porous surfaces such as moisture remediation barriers, ceramic tiles, metals, well-bonded cutback adhesives and plywood or OSB surfaces for the application of an appropriate CUSTOM® self-leveling underlayment. It seals porous surfaces and improves the bond of the underlayment to the surface.

  • Features & Benefits
  • Technical Documents
  • Warranty Information

Key Features

  • For use over non-porous surfaces
  • Outstanding bond strength
  • Solvent-free

Suitable Substrates

  • Absorbent concrete 
  • Non-absorbent concrete 
  • Lightweight concrete 
  • Existing ceramic tile 
  • Epoxy & cement terrazzo 
  • Exterior grade plywood 
  • OSB 
  • Cutback adhesive residue 
  • Resilient flooring 
  • Moisture control layer

Composition & Materials

  • Part A: Polymer-modified epoxy resin
  • Part B: Polymer-modified amine hardener


  • CP-WE should not be installed at temperatures below 50°F (10°C) or above 90°F (32°C).
  • Concrete tensile strength must be greater than 200 psi (1.4 N/mm2).
  • MVER of concrete must be less than 3 lbs/day/1000 sq ft (ASTM F1869) or 75% rh (ASTM F2170).
  • Substrate must be free of bond-inhibiting or bond-breaking materials such as curing compounds, oil, grease and wax.
  • Repair all dormant or non-moving cracks with FeatherPatch or GeneralPatchbefore installation of CP-E as a primer.
  • Honor all expansion and control joints, through primer and underlayment.
  • Do not bond to hardwood, Luan plywood, particle board, parquet, sheet vinyl, cushion or sponge-back vinyl flooring, metal, fiberglass or plastic.


Two-part two gallon kit:

  • One gallon Part A
  • One gallon Part B

Technical Data

Applicable Standards

  • Concrete Floor Preparation for Resilient Flooring, ASTM F710
  • ASTM C1708 Standard Test Methods for Self-leveling Mortars Containing Hydraulic Cements


Technical Data Sheet Material Safety Data Sheet Part A - English Material Safety Data Sheet Part A - French Material Safety Data Sheet Part B - English Material Safety Data Sheet Part B - French

Product Warranty

Custom® Building Products warrants to the original consumer purchaser that its product shall be free from defects in material and workmanship under normal and proper usage for a period of one year following the date of original purchase. Custom's® sole liability under this warranty shall be limited to the replacement of the product. Some states, countries or territories do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty will not extend to any product which has been modified in any way or which has not been used in accordance with Custom's® printed instructions. Custom® makes no other warranties either expressed or implied. This warranty gives you specific legal rights, and you may have other rights that vary from state to state or from one country/territory to another.  This warranty is not transferrable.

Related Products


CL-150 Self-Leveling Underlayment

View Product Details

CL-XP1 Self-Leveling Underlayment

View Product Details

© 2014 Custom Building Products. All Rights Reserved.