The Novol N91471 STP Glass Primer is a professional-grade, black-pigmented bonding agent specifically designed for use with the Novol N91470 STP Glass Windscreen Adhesive. This 30ml bottle is an essential component of the direct-glazing process, serving two critical functions: ensuring a "bomb-proof" chemical bond between the glass and the adhesive, and protecting that bond from the degrading effects of sunlight.
In modern automotive repair, skipping the primer is the leading cause of windscreen leaks and, more importantly, structural failure during an airbag deployment.
Key Features & Benefits
- Superior Adhesion Promoter: Creates a high-strength chemical "bridge" between the smooth ceramic frit of the windscreen and the STP adhesive.
- Total UV Barrier: The deep black pigment acts as a 100% opaque shield, protecting the adhesive from UV radiation which can cause standard polyurethane or STP bonds to become brittle and fail over time.
- Anticorrosive Protection: When applied to small scratches or nicks in the paintwork of the window aperture (pinch weld) caused by glass removal tools, it acts as a protective barrier to prevent rust from forming under the seal.
- Fast Flash-Off: Formulated to dry rapidly, allowing the technician to apply the adhesive and set the glass within minutes of priming.
- Visual Guide: The distinct black finish makes it easy to see if you have achieved full, uniform coverage on the glass border.
Professional Application Guidelines - Preparation: The glass surface must be 100% clean and dry. Use Novol Silicone Remover or a dedicated glass cleaner to remove any fingerprints, oils, or factory release agents.
- Shake Well: You must shake the bottle for at least 2 minutes before use. The active solids and pigments settle at the bottom; if not mixed, the primer will not provide UV protection.
- Application: Use a disposable felt applicator (dauber) or a lint-free swab. Apply a single, continuous, uniform coat to the ceramic border of the glass. Do not go over the same area twice, as this can soften the first layer and lead to a poor bond.
- Flash-off Time: Wait at least 10 minutes (but no longer than 1 hour) before applying the STP Glass Adhesive. If left for more than 24 hours, the surface must be cleaned and primed again.
- The Pinch Weld: If the paint on the vehicle body was scratched during glass removal, apply a thin layer of primer to the bare metal to prevent corrosion.
Why Is the N91471 Primer Essential?
Windscreens are a structural part of a modern car's chassis. Without the N91471 Primer, the adhesive may stick initially, but the bond will eventually "delaminate" from the glass due to moisture and UV exposure. Using this 30ml primer is the only way to guarantee a repair that meets OEM safety standards and remains leak-free for the life of the vehicle.
