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    Bonding primer being applied to built-up roof surface

    Bonding Primers

    Adhesion-promoting primers formulated for smooth, low-energy, or difficult substrates such as TPO and PVC. They create a reliable bond surface that improves coating performance and helps ensure consistent system application.

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    Frequently Asked Questions

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    Bonding primers are roof preparation products used to improve adhesion between an existing roof surface and a coating, sealant, mastic, or restoration system. They help create a stronger connection between the substrate and the material being applied over it.

    Bonding primers should be used when a roof surface needs improved adhesion before coating or repair work. They are commonly used on difficult, aged, weathered, or previously coated surfaces where direct application may not provide the required bond strength.

    Bonding primers help coatings and repair materials adhere more consistently to the roof surface. Better adhesion reduces the risk of peeling, delamination, blistering, and premature system failure, especially on challenging substrates.

    No. Bonding primers are not always required, but they may be necessary depending on the roof substrate, surface condition, coating chemistry, and project specification. Adhesion testing is the best way to determine whether a primer is needed.

    Bonding primers may be used on surfaces such as single-ply membranes, metal, concrete, asphaltic roofs, aged coatings, and other substrates where adhesion needs to be improved. The correct primer depends on the existing surface and the restoration system being installed.

    Yes. Adhesion testing is strongly recommended before applying any roof restoration system. It helps confirm whether the coating will bond properly to the surface and whether a bonding primer is needed to meet performance requirements.

    Yes. Bonding primers are designed to be coated over after proper application and cure time. Once ready, they help the next layer bond more effectively to the roof surface as part of the overall restoration system.

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