N49 Primer is clear in appearance. It is designed for use with Bostik Polyurethane sealant range to ensure adhesion to porous substrates. For non-porous substrates such as plastics and metals, refer Bostik N40 primer.
As primer to enhance adhesion of PU sealants to porous substrates such as concrete, render and masonry. Sealants requiring the application of Bostik N49 primer on porous substrates are ;
Sealant must be applied within 4 hours or re-priming is required. A sample test application is recommended on all substrates as staining may occur where the primer has been applied to areas not covered by polyurethane sealant.
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