Cool Cover™ TPO Edge Sealant

1 of 4 products in this brand
Cool Cover™ TPO Edge Sealant is a high-solids, low-VOC, elastomer-based white edge sealant designed to seal the exposed edges of TPO membrane splices and laps. The sealant has excellent adhesion to TPO membranes as well as various other substrates, including EPDM, metal, wood, and concrete. The sealant can be used on TPO as well as EPDM roofing systems. Cool Cover™ TPO Edge Sealant is suitable for use in VOC-regulated markets such as California and the O.T.C. States.

Product Type: Edge Sealant, Solventborne Adhesive

Application Area: Joints, Roofing Substrates, Roofs

Compatible Substrates & Surfaces: Concrete, Ethylene Propylene Diene Monomer (EPDM), High Density Polyethylene (HDPE), Metal, Thermoplastic Polyolefin (TPO), Wood

Features: Crack Resistant, Good Sagging Resistance, Good Shrinkage Resistance, Heat Resistance, High Durability, High Solids Content, Moisture Resistant, Resistance to UV lights, Solvent-Based

Technical Data Sheet
Message our experts with questions
Robert Blackstone avatar

Robert Blackstone

Global Leader - Inside Sales

Please reach out to me with any questions, I am happy to assist you in finding the right product or learning more about our storefront

Enhanced TDS

Identification & Functionality

Features & Benefits

Labeling Claims
Ready-to-Use Product Features
Product Highlights
Features Benefits
Low VOC formula (<250 g/L)

Suitable for use in VOC regulated markets

Excellent adhesion to a variety of substrates  (EPDM, metals, wood, and concrete)

Suitable for a wide variety of applications

Resistant to UV light, high heat, and moisture

Long-term durability

High solids content

Resistant to shrinking and cracking

No sag or flow

Suitable for both vertical and horizontal application

Applications & Uses

Application Area
Compatible Substrates & Surfaces
Recommended Applications

Cool Cover™ TPO Edge Sealant is designed to seal the exposed edges of TPO membrane roof system splices, T-joints, step downs, tie-ins, termination bars and general flashing details. Utilizing the provided patented feathering tip, Cool Cover™ TPO Edge Sealant can be leveled as applied removing the need for post-application sealant tooling. TPO Edge Sealant is an important finishing detail that functions to protect seam edges from freeze-thaw interactions and extends the life of an installlled TPO waterproofing system.

Application Methods


  • Prior to application insure that all seams and/or flashings are properly installlled according to TPO roof system manufacturer’s guidelines. Cool Cover™ TPO Edge Sealant is not intended to repair a structurally unsound seam.
  • Cut nozzle tube for desired bead size. Place patented feathering tip over cut nozzle prior to installing cartridge into caulking gun.
  • Gun ¼” (6.4mm) size bead of Cool Cover™ TPO Edge Sealant along the exposed edge of the membrane seam splice of flashing detail. Note: for best results prime exposed edge receiving sealant with Millennium Single-Ply Primer or Millennium Primer 240 prior to sealant application.
  • No tooling of installed sealant is necessary if feathering tip is used. If feathering tip is not used, tool the sealant. Tool the sealant bead so the high point is above the offset of the splice and the edges are feathered onto the deck.
  • Taped membrane and flashing seams must be allowed to age at least 2 hours before Cool Cover™ TPO Edge Sealant is installed. This insures any residual solvent from tape primer has been removed. Refer to TPO roof system manufacturer’s guidelines for additional recommendations. Sealant will remain tacky up to 1 hour and will require up to 3-4 days to fully cure.

Surface Preparation

All work surfaces should be clean, dry, and free of dirt, dust, debris, oils, un-adhered coatings, deteriorated membrane and other contaminants that may result in a surface that is not sound or is uneven. If necessary, clean the surface to receive cover with an approved TPO membrane cleaner.

  • Not to be used as a splicing cement between TPO or EPDM membranes.
  • Talc, dust, oil, ice, snow, or wet conditions inhibit good adhesion. Clean and dry surfaces are necessary for proper Installation of this product.

Coverage rate will be approximately 20 - 22 lineal feet (6.0 - 6.7 m).


Typical Properties
ValueUnitsTest Method / Conditions
Weight per Gallon11.6lbsASTM D 1475
Tack Free Timemax. 1HourASTM D 2377
Cure Rateapprox. 72HoursASTM D 2377
VOC Contentmax. 250g/LASTM D 2369
Solids Content84%ASTM C 681
Flash Point10.0°CASTM D 56
Service Temperature Range-40 - 93°CASTM D 3359
Application Temperature-6 to 49°CASTM C 603

Packaging & Availability

Packaging Type
Regional Availability
  • Africa
  • Australia & New Zealand (ANZ)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America
  • South East Asia
Packaging and Coverage

Millennium EPDM Edge Sealant is available in the following package:

Cartridge Size Part # Cartridges/Case
10.3 fl. oz. (300 mL) CT-6420 12

Storage & Handling

Shelf Life
24 Months
Storage Conditions

Store material in original unopened packaging at temperatures between 40°F-110°F. (4°C-38°C). Shelf life is 24 months when stored as recommended.