Childers® CP-137 Protective Coating

1 of 37 products in this brand
Childers® CP-137 Protective Coating is an interior-grade, water-based adhesive and coating characterized by its dense, cream-like texture. This versatile product is suitable for a range of applications, including creating a durable film on surfaces like canvas and glass cloths. Because it is water-based, it is safe to use and will not harm plastic foams or other adhesives.

Product Type: Waterborne Adhesive

Application Area: Duct Liner, Equipment, Insulators, Pipes

Application Method: Brush, Spray

Features: Abrasion Resistant, Bacteria Resistant, Fire-Resistant, Fungus Resistant, Good Bonding Strength, Good Washability, Highly Versatile, Microbe Resistant, Mildew Resistant, Mold Resistance, Water-based

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Identification & Functionality

Features & Benefits

Labeling Claims
Ready-to-Use Product Features
  • CP-137 coating is non-flammable in the wet state and fire resistive when dry.
  • It contains no solvents to attack insulations or facings.
  • The viscosity permits overhead and vertical applications that do not sag or run for additional ease of application.
  • The combination of properties afforded by this material gives it great versatility both as an adhesive and a coating.
  • The polymeric resins make this an adhesive of high bond strength.
  • The tough film is washable and is abrasion resistant.

Applications & Uses

Application Area
Application Method
  • CP-137 coating is used for adhering fabrics such as glass cloth, canvas and brattice cloth to many insulated surfaces such as round and rectangular duct work and equipment.
  • It is also used for adhering the laps of these fabrics as well as some woven glass cloths on pipe insulation.
  • CP-137 is used as a protective coating over all of the above mentioned fabrics and also finds use as a coating over plastic foam materials such as polystyrene.
  • CP-137 coating can be brushed on the joints and edges of duct liner insulation to help prevent air erosion of the glass fiber.
Suggested Specifications

Pipe Insulation, Duct Insulation and Equipment 

  • All insulation finished with canvas (or other fabric finishes) shall be bonded with and have their laps adhered with CP-137 coating.
  • Apply only to clean, dry, oil-free surfaces. Apply a tack coat at 60 – 70 sq. ft. per gal. (1.5 – 1.7 m2 /l).
  • Immediately embed the selected lagging fabric into the wet coating.
  • Smooth to avoid wrinkles and overlap seams by at least 2 inches (5 cm).
  • Immediately apply a finish coat at 60 – 70 sq. ft. per gal. (1.5 – 1.7 m2 /l).
  • The dry film thickness of this application will vary with the fabric selected.
  • For air conditioning ducts, increase the coverage rate to 40 – 50 sq. ft. per gal. (1.0 – 1.2 m2 /l) for each coat.

Notes to Specifying Engineer

  • It is recommended that in using most types of pre-sized glass cloth facings, CHIL-STIX® FRN CP-82 Adhesive be used as the lap adhesive.
  • The above suggested specification is for hot piping and equipment. It may be used for equipment operating as low as 55°F (13°C) in northern climates where a material with a perm rating of 1.5 is adequate.
  • If CP-137 is to be top coated with anything other than an alkyd enamel conforming to DOD-E-24607 as specified in MIL-A-3316C, the user must confirm by his/her own tests that the products are compatible and that the final results are satisfactory.
Preparation and Application Information

Use of Material 

  • CP-137 coating brushes easily despite its somewhat heavy appearance.
  • It should be stored indoors and above freezing temperatures, and should not be applied below 40°F (4°C) nor above 100°F (38°C) for best results. Stir Well, Do Not Thin.

The Condition of the Surface to Be Adhered or Coated 

  • Certain surfaces which are dusty or porous such as calcium silicate or certain mineral fiber materials should first be primed with a light coat of CP-137 adhesive diluted 50% with water for proper bonding.
  • A coating or adhesive will adhere no better than the integrity of the surface to which it is applied.
  • Not suggested for outdoor use.


  • CP-137 coating is extremely easy to apply by brush and the same procedure would be used as applying latex paints or similar brush-on coatings.
  • Brushes or other tools should be kept in water and cleaned with hot, soapy water.
  • CP-137 coating may be sprayed with many types of equipment, including airless spray.
  • It may also be sprayed with conventional mastic spray equipment using an external atomizing spray gun.
  • Average viscosity range: 55,000 – 75,000 cps.
  • For best results, we suggested the following airless spray equipment.

Graco Bulldog Hydra-Mastic, 40:1 ratio
(model 204-925) air regulator with inductor
plate (207-039)


Capable of 75 CFM and maintaining 100

Fluid Hose

High pressure capable of 4,000 PSI. One
inch up to 150 feet. 3⁄4” after the first 150
feet. Use 8’ (2.4 m) 1⁄2” I.D. hose for
coupling to the gun


Graco Hydra-Mastic #207-300 with
Reverse-A-Clean 205-614

Tip Sizes 627 to 635

Hints for Success

  • CP-137 coating is an excellent adhesive and also has good resistance to many chemicals and solvents. Spillage of this material should be cleaned immediately.


Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Average Wet Weight10.4lbs./U.S. gal.ASTM D1475
Average Non-Volatile (by Volume)40.0% ASTM D2369
Average Non-Volatile (by Weight)51.0% ASTM D2369
Drying Time (Set to Touch)2.0Hours-
Drying Time (Dry Through)16.0Hours-
Coverage Range ¹40 - 70sq. ft. per gal.
Wet Film Thickness (Per Coat)1.0 - 0.6mm-
Water Vapor Permeance (at 0.031 in. dry film thickness)0.5 - 1.5perms
Application Properties
ValueUnitsTest Method / Conditions
Service Temperature (to which dry adhesive is subjected)0 - 180°F
Application Temperature Range4 - 38°C-
Flame Characteristics
ValueUnitsTest Method / Conditions
Flame Spread ²10ASTM E84
Smoke Developed ²5

Regulatory & Compliance

Certifications & Compliance
Chemical Inventories
Quality Standards
  • California Dept. of Public Health Standard Method v1.2
  • VOC Emissions and Content requirements to contribute to LEED v4 EQ Credit: Low Emitting Materials - Paints and Coatings
  • Collaborative for High Performance Schools EQ 7.1
  • Meets NFPA Standard 90A & 90B requirements
  • Meets the performance requirements of MIL-A-3316C, Class 1, Grade A

Storage & Handling

Shelf Life
12 months