National Coatings Blog

Case Study: Direct Adhesion to Failing TPO Roof without Primers or Etching Rinse

Posted by Nicole Gale on Thu, Jun 11, 2015 @ 11:00 AM

Case Study Using AcryShield A502
Westinghouse Drive

Size: approximately 85,400 SF
Location: Fremont, CA
Contractor: Just Leaks, Inc.
System: National Coatings AcryShield® Roof Management System

Challenge: Failing TPO Roof

  • To extend the life of the existing TPO membrane.
  • Install a coating system that does not require a costly tear-off.
  • Stop existing leaks.

Solution: AcryShield® Roof Management System

  • Opportunity to reinforce trouble spots like drains, penetrations and waterways with polyester reinforcing fabric.
  • The system added many more years of service life to the existing roof membrane.

Learn More About Coating Over  Aged  Single-Plies "One of our best jobs for the year was on Westinghouse Drive in Fremont, CA where we restored an old TPO roof system. The building owner was convinced he needed to tear off the old TPO system and install a new one. National Coatings was able to provide us with case studies demonstrating that a restored TPO roof would result in a more robust and less expensive roof system. The AcryShield A502 had perfect adhesion to the failing TPO. We also avoided the exposure of a torn off roof on a 93,000 square foot building. Thanks so much to Tom Absher (NCC Sales Rep) and Missy DeLaTorre (NCC Customer Service and Business Development Manager)!" - Scott Siemer, President of Just Leaks, Inc.




Preserve Existing Single-Ply without Primers Click Here to Learn More!

Tags: Single-Ply Roof Coatings, Coating directly over TPO, TPO Roof Coating, Singleply Roof Coating Systems

Direct Adhesion for Hard to Coat Single-Ply Roofing Membranes

Posted by Nicole Gale on Tue, Jun 09, 2015 @ 11:00 AM

National Coatings has the unique ability to address the difficulties and failures that aged single-ply roofing experiences. Most roof coatings require caustic primers, acid etching agents, or high VOC solvents that need to be rinsed off and sometimes collected for disposal, adding additional cost to a roof life extension project. NCC's products have the unique ability to coat to single-ply roofing membranes without the need to use any of these harmful products. Our state of the art single-ply coating systems adhere directly to single-ply substrates providing a monolithic membrane without any of the seams that can be prone to failure. Coating restorations do no count as a new roof under most building codes, eliminating the need for periodic and costly tear-off's. This process allows for a truly sustainable roofing system by performing coating maintenance every 10 years.

AcryPly_Acrylic_Diagram_-_A502_eliminatedWhat's our secret? The AcryShield® A502 base coat! This single-ply base coat is the industry leader, ultra low VOC, high performance base coat for hard to coat surfaces such as Hypalon®, TPO, EPDM, and PVC roofing. A502 base coat eliminates the need for costly roof replacement and provides unique AcryLock technology to tenaciously adhere directly to EPDM, TPO and Hypalon without the need for additional primers or an etching rinse. A502 also provides an additional layer of waterproofing, superior adhesion, and resistance to ponded water.

FREE GUIDE: Single-Ply Roof Coating Systems

  • Lower project cost and higher job efficiencies
  • Special work place safety requirements are reduced or eliminated
  • Safer work conditions
  • Elimination of need to capture caustic contaminated water as required by some municipalities
  • Prolonged Roof Life
  • Reduced Life Cycle Costs
  • Sustainable Roofing
  • Seamless Waterproofing
  • Fully-Adhered Installation
  • Acrylic Durability

UL 790 Class A Rating   

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Factory Mutual Standard 4470 for Class 1 Fire, Windstorm, & Hail Classification

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 ICC-ES ESR-2140

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California State Fire Marshall

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ASTM D6083 Technical Data




Typical Result




Theoretical Coverage


66 sq. ft/gal

Wet Adhesion - Hypalon (pli)

2 Minimum


Wet Adhesion – TPO (pli)

2 Minimum


Wet Adhesion – EPDM (pli)

2 Minimum


Volume Solids (%)

> 50

54 ± 2

Weight Solids (%)

> 60

67.7 ± 2

Weight per gallon


11.88 lbs

Viscosity (KU)


110 ± 10

Drying Time (hrs)


4-8 hours*

*Drying time is dependent on temperature & humidity

ACRYSHIELD A502 is for industrial/commercial applications only.  These suggestions and data are based on information we believe to be reliable.  They are offered in good faith, but without guarantee, as conditions and methods of use are beyond our control. Click here to view our full Product Data Sheet on AcryShiled A502 

Download our FREE Roof Coating Systems Benefits Brochure

Tags: Single-Ply Roof Coatings, Coating directly over TPO, Coating directly over EPDM, Coating Directly over Hypalon, TPO Roof Coating, TPO Roofing System, Singleply Roof Coating Systems

Can an Elastomeric Coating Save my Leaking TPO Roof?

Posted by Nicole Gale on Tue, Jan 20, 2015 @ 12:00 PM

AcryPly_Acrylic_Diagram_-_502TPO_2Elastomeric coating systems are ideal for restoring and renewing aged and failing TPO roofs. These roof coating systems allow you to avoid a costly and timely roof tear off, while achieving a highly reflective, watertight, energy efficient roof. 

TPO Roofing
TPO roofing is originally installed by welding the seams of the rolled out TPO to one another. These seams can cause roof failures and water penetration if the installation was not done correctly and/or after these seams have weathered.  Over time, the seams lose their ability to expand and contract with the rest of the roof causing rips and tears, eventually leading to a leaking roof - prompting building owners to look for a cost-effective solution.

Solution for Restoring TPO
Although TPO has been notorious for being difficult to coat over, the AcryShield A502 adheres directly to TPO with tenacious adhesion and extremely low levels of harmful VOC solvents. This elastomeric coating is ideal for TPO roofing because it eliminates the use of a separate primer prior to the installation of a base coat. Most roof coating manufacturers require a primer or etching rinse to be applied prior to a base coat. The application of primers and etching rinses generally entail the application, the chemical wash-off, and the capturing of the harmful chemicals before they run off into streets and streams. This additional primer step increases cost and lengthens the installation time frame. Using the AcryShield A502 base coat, contractors can quickly install your new roof coating system with direct adhesion to the TPO roof – saving the building owner time and money.

FREE GUIDE: Single-Ply Roof Coating Systems

Two TPO Elastomeric Roof Coating Systems
We offer two elastomeric coating systems that are ideal for TPO roofing. The first is the AcryPly Roofing System; it restores your extremely weathered and aged TPO roof with the use of polyester reinforcing fabric across the entire rooftop to create an extremely durable and strong roof. The second is the AcryShield Roof Management System (ARM), it renews your TPO roof to new when it is in its initial stages of decomposition and only needs local reinforcement in necessary areas. Both systems provide you with the following benefits:

  • Eliminates a costly roof tear-off
  • Non-intrusive application process
  • Energy Efficiency and Cost Savings
  • Highly Reflective Cool Roof System
  • Renewable and Sustainable
  • Reduce Roof Maintenance
  • Seamless
  • Environmentally Friendly – No Harmful Primers/Etching Rinse and Ultra Low VOCs

For additional information on our TPO AcryPly Roofing System, download our free brochure or for information on our TPO AcryShield Roof Management System, download that brochure, here.

Get More Info on Direct Adhesion to Aged &  Failing EPDM, TPO & Hypalon  

Tags: Single-Ply Roof Coatings, Coating directly over TPO, TPO Roof