Securing automotive glass with Autoshield 1-FC polyurethane demands uncompromising bond integrity. Autoshield GB Primer establishes the robust linking layer needed for reliable adhesion on diverse automotive glass and body substrates. Its unique UV fluorescence provides visual, in-process quality control, bringing confidence to every direct-glazing installation.

Why this product exists

Adheseal GB Primer was formulated to prevent adhesion failure between an Adheseal Autoshield 1-FC polyurethane adhesive and automotive glass or body substrates. It is a solvent-based black primer designed to react with moisture, forming a thin, reactive linking layer between the bond face and the adhesive. Unlike general-purpose primers, Autoshield GB Primer is precisely formulated for this specific chemical system and substrate range. Its integrated UV fluorescence allows for in-process application control, ensuring complete and uniform coverage across the bond line.

The numbers that matter

• Solid content: 27% — This high solid content in the solvent-based polyurethane solution ensures a substantial linking layer is formed upon application. It's the foundation for the robust adhesion this primer provides, directly impacting the final bond strength.
• Application temperature: 5–40 °C (ideal 15–25 °C) — This broad temperature range offers flexibility on site, but the tighter 15-25 °C window indicates where the primer performs optimally. Working outside this ideal range means managing environmental factors more closely to ensure consistent flash-off and bonding.
• Flash-off time: 10 minutes maximum (above 5 °C), up to 24 hours depending on temperature — The initial 10-minute flash-off ensures solvents evaporate quickly for efficient workflow. However, recognising that full solvent evaporation can take up to 24 hours, especially at lower temperatures, is crucial for preventing solvent entrapment and subsequent bond issues if the adhesive is applied too soon.

What it's like to use

Preparation begins with thoroughly shaking the can until the mixing ball rattles freely, continuing for an additional minute to ensure the black pigment and reactive components are uniformly dispersed. Apply a thin, covering coat using a brush, felt, or foam applicator. Ensure the application is single-pass and provides adequately dense coverage. The ideal application and surface temperature for best results is between 15 °C and 25 °C. After use, immediately reseal the container tightly with the inner plastic liner and screw on the cap. Never dilute or mix this product with other substances.

For in-process quality control, use a light source with a wavelength of 320 to 420 nm. The primer will fluoresce, allowing you to verify 100% coverage. Reduce ambient light (sunlight or artificial) during detection to improve visibility, but be aware the luminescent effect will degrade over time.

Where this product excels

• Automotive Glass Installation: Providing enhanced adhesion for Adheseal Autoshield 1-FC polyurethane on float glass and ceramic-coated glass, ensuring a durable, structural bond in direct glazing applications.
• Painted Metal Bonding: Creating a strong linking layer on a variety of painted surfaces, E-coats, and metals, which is critical for securing glass to vehicle bodies without compromising the finish or bond integrity.
• Plastics and Pre-Coatings: Improving adhesion on diverse plastics and pre-coated surfaces commonly found in automotive assemblies, where standard adhesives might struggle to achieve a reliable bond.

How it fits in a real system

Autoshield GB Primer is an essential component of the mandatory 3-step Adheseal Autoshield direct-glazing system. It is step 2 in this sequence, creating the necessary linking layer after surface activation and before adhesive application.

1. Step 1: Adheseal Autoshield Activator — Use this to clean and activate glass and lacquer surfaces with a wipe-on/wipe-off method, preparing the surface for optimal primer adhesion.
2. Step 2: Autoshield GB Primer — Apply a thin, uniform film to the prepared glass and body substrates. Allow the primer to flash-off for 15–60 minutes, ensuring proper solvent evaporation before the next step.
3. Step 3: Adheseal NP-60 Autoshield — Apply the triangular bead of this single-component polyurethane adhesive and press the glass into place firmly before the adhesive forms a skin.

Following this specific sequence ensures maximum adhesion performance and durability for your automotive glass installations.

Choose this when

• For robust adhesion with Autoshield 1-FC: Select this primer when you need a chemically-engineered linking layer between diverse automotive glass and body substrates and Adheseal's Autoshield 1-FC single component Polyurethane.
• When visual quality control is critical: Use Autoshield GB Primer to leverage its UV fluorescence, allowing you to visually confirm complete primer coverage during application for consistent bond reliability.
• To prepare diverse automotive surfaces: Choose this primer for its proven adhesion enhancement on float glass, ceramic-coated glass, plastics, pre-coatings, painted surfaces, E-coats, and metals in automotive direct glazing.

Don't use this when

• Not for: General construction priming on porous substrates like concrete or masonry. For these applications, refer to Adheseal Primer 2001.
• Not for: General-purpose non-porous construction priming on glass, metal, or plastics outside of the Autoshield system. For these applications, consider Adheseal Primer 50A.
• Not for: Use without adequate testing on materials prone to stress cracking, or if application temperatures are consistently below 5 °C without specific pre-testing.
• Not for: Use by inexperienced personnel without proper training, or if the product shows signs of gelling, separation, or increased viscosity; discard immediately.

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