September 13, 2016 - Building & Construction

Considerations to Make When Painting High Performance Sealants: Part One

Construction is one of the largest market areas for sealants. With applications ranging from foundation walls to roofs, sealants are needed throughout residential and commercial building projects.

These sealants must offer flexibility, temperature stability, weather resistance and chemical flexibility. High performance sealants in particular offer additional properties such as:

  • Meeting or exceeding industry specifications/accreditations
  • Lower volatile organic compounds (VOCs)
  • Greater elastic bonding capabilities
  • High elastomeric properties

However, these high performance sealants do not come in a variety of colors and often need to be painted to match surrounding areas. Let’s take a look at general considerations to make when painting high performance sealants.

Dynamic Movement 

Paint typically cannot withstand high performance sealants’ dynamic movement and may crack or peel. It’s important to know the anticipated movement ahead of time. Then, the paint manufacturer can be consulted to determine the ability of the paint to accommodate the movement.
high performance sealantsStaining 

In some cases, a stain application may be needed or desired. High performance sealants do not possess the same surface porosity as the adjoining wood, for example. As a result, the sealant may not be able to perform to the desired outcome.

For example, if attempting to stain wood, the sealant is unable to absorb the stain in the same manner. This increases possibility of different shades of stained surfaces. Ensure that the customer fully understands the sealant performance expectations prior to staining and will be satisfied with the overall aesthetic look.

Chemical Compatibility 

It’s recommended that the chemical compatibility between the paint and sealant is verified prior to painting. This means understanding whether or not the paint dries or cures once applied to the sealant. While it appears dry or cured, a surface tack can sometimes develop on the paint surface. There may be no evidence of paint transfer; however, a tacky surface can increase the likelihood of dirt pick up.

This tackiness can be from a variety of causes, which is why Bostik recommends a jobsite adhesion test prior to starting the project. This test captures any site-specific anomalies that could impact the final outcome.

For more information on smart high performance sealants, call 800-7-BOSTIK.

Stay tuned for our upcoming post on the paintability of high performance sealants based on their technologies.

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