National Coatings Blog

Repairing and Recoating AcryShield® Coated Roofs

Posted by Nicole Gale on Thu, Apr 10, 2014 @ 11:00 AM

roof coatings


One seldom mentioned benefit of the National Coatings AcryShield product line is that the coating can be easily recoated over itself.  Thus, after a decade or more of successful performance, when the coating becomes thin, additional coating millage can be applied without extensive preparation.
Recoating with AcryShield


Before recoating, the coated roof surface must be clean, dry and free of materials that would compromise adhesion.  This includes dirt, chalked coating, and other airborne materials that may have accumulated, such as grease, and particulate material from nearby exhausts.  Typical cleaning techniques involve the use of pressure washer.  Be sure to keep the pressure to a minimum to avoid damaging the underlying roof membrane seams.  National Coatings Corporation Cleaner or common TSP may be required to thoroughly clean the originally coated roof.
After the roof is cleaned, there is a simple technique to insure the roof is sufficiently clean for recoating.  A piece of masking tape is pressed onto the roof and peeled off.  If the tape adheres well, and does not come off easily, the roof is sufficiently clean for recoating.  However, if the tape comes off easily, and carries with it chalked coating, dirt, mildew or other particulate, the roof is not clean and must be recleaned. 
Cracks and Punctures in the Coating and Underlying Membrane
During the service life of the roof, punctures, holes and cracks may have occurred in the coating.  These cracks may extend through the coating and well into the roofing membrane below.  The repair will be different depending on the type of roofing membrane. 
For asphalt, modified bitumen, and sprayed polyurethane foam (SPF), National Coatings Corporation AcryFlex trowelable sealant can be applied over the crack or hole with a spatula.  The sealant should be pressed into the membrane being sure there is no air trapped under the sealant.   Large cracks, greater than 1/8" wide should be reinforced with P272 polyester reinforcement scrim.  Large holes in SPF roofs may require a foam "plug" to be inserted into the hole.  The plug should be imbedded and sealed with AcryFlex sealant.
For thermoplastic and thermoset single plies, a piece of P272 polyester reinforcement 6" larger than the edge of the puncture and pressed into the AcryFlex trowelable sealant.  A second application of AcryFlex is applied.  After drying, AcryShield coating is applied.  
An alternative repair technique for EPDM is to first clean the coated roof, then apply a patch of a non-vulcanized peel-and-stick material.  The roof can be coated immediately after applying the patch.
Applying the Coating
The coating can then be applied to the cleaned roof surface.  The technique is analogous to applying the original coating.   For specifics, follow the Guide Specifications found on the National Coatings Corporation website.
The roof has now been restored to its original condition and original solar reflectance.  This process can be repeated many times over, saving the building owner countless thousands of dollars in reroofing expenses. Moreover, since this recoating does not qualify as a recover roof, it is not bound by the code requirements allowing only 2 roofs to be installed before both must be removed due to load constraints.  For the contractor there is an immediate economic benefit: it creates an easy opportunity for repeat business with an established client.

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Contractors – Do you need to Save Time and Money for your Roofing Company to be Profitable?

Posted by Nicole Gale on Tue, Apr 08, 2014 @ 11:00 AM

roofing company

National Coatings has a roof coating that allows for direct adhesion to hard to coat single-ply surfaces such as TPO, EPDM and Hypalon. The AcryShield A502 base coat is a high performance elastomeric, ultra low VOC, water-borne base coat. This roof coating is ideal for lowering project cost and promoting higher job efficiencies for your roofing company.

Contractors are able to save money and time using the AcryShield A502 base coat by eliminating the following steps:

  • No need for a separate primer prior to applying the base coat
  • No need to do a chemical wash off from the primer
  • No need to capture the harmful chemicals from the primer so they don’t run off into the streets or streams

We offer two different single-ply roofing systems that use the AcryShield A502 base coat. The AcryShield Roof Management (ARM) System is ideal for roof maintenance and the AcryPly All Acrylic Roofing System is ideal for restoring older roofs that have additional aging issues. These systems are excellent for your roofing company because they are easy to install, as they are spray applied. This allows you to cover seams, equipment joints, pipes, etc… creating a seamless, watertight membrane that is custom tailored to meet the specific needs of your clients’ roof. Additionally, these systems are available with a 10, 15 or 20-year warranty.

Click on the hyperlink for more information on our roof maintenance system – ARM Roofing System using A502 or our roof restoration system – AcryPly All Acrylic Roofing System using A502.

Tags: Roof Systems, Roof System, Roof Restoration, title 24 roofing products, Single-Ply Roof Coatings, Commercial Roofing, roof leak repair, Coating directly over TPO, Coating directly over EPDM, Coating Directly over Hypalon, Hypalon Roof Coating, Coating EPDM, Roof Coatings for EPDM, roofing repairs

3 Common Applications for Roofing Repairs Using a Roof Coating

Posted by Nicole Gale on Tue, Apr 01, 2014 @ 11:00 AM

We want to begin this blog by stating National Coatings never suggests or promotes patching or repairing sections of your roof without consulting us first - Call us! We truly are here to help you 800-423-9557. We suggest this specifically because some roofing materials contain ingredients that are incondusive to coatings and when sections of your roof contain these materials, it becomes a much more strenuous process to preserve and restore your existing roof. It can also potentially eliminate your option to save money and restore your existing roof by adding a Roof Maintenance or Restoration System. Thus forcing you into a roof tear-off, which is an expensive and timely project.  

Okay, so let us begin. The three most common applications for roofing repairs when applying a roof coating are the following: airless spray machine, a roller and a brush/broom.

roofing repairs

Airless Spray Machine

Using an airless spray machine is an ideal tool for applying roof coating over a roof because it allows you to cover large sections of the roof with less labor and time. These machines pump and disperse the roof coating through a spray tip, spraying a consistent and even amount of coating onto the roof surface. It is recommended that the coating be applied in several cross-directional layers to confirm full coverage. You must keep in mind that wind can create issues with uniformity so be sure to either check the weather conditions before application or make sure you have a wind shield to avoid overspray.


Rollers for roof coating are similar to rollers for painting. They come in short-nap, medium-nap and long-nap lengths depending on your needs. In some circumstances you will need a specialized roller to ensure full coverage over uneven surfaces and seams. Rollers offer consistency of coating thickness and placement. This application method for roofing repairs is more time consuming than using a spray machine, but may provide better consistency and outcome if you are not too familiar or comfortable with a fast spraying roof coating machine. 

Brush or Broom

Using a brush or soft-bristle broom for roofing repairs is ideal in small areas only. You do not want to coat the entire roof surface with just a brush or broom.  This application method can be beneficial for small areas and those that require a little extra attention to detail for either aesthetics or waterproofing. 

National Coatings provides application guidelines for all of our roofing systems. Make sure you follow the guidelines recommended to ensure proper application and coverage of the roof coating system you choose.  Often times, a spray machine and  roller or even a combination of the three methods discussed above are great tools to have accessible while completing a roofing repair project.

For more information, check out our Guide for Selecting Roof Coating Spray Equipment or contact us!

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