Polyvinyl Alcohol (PVA)

Product Overview

PVA glazing agent is a water- and alcohol-based film-forming solution used as a parting agent in composite moulding. Applied as a barrier over wax-treated or sealed moulds, it ensures clean, defect-free demoulding—especially beneficial for intricate, reconditioned, or first-use moulds. The dried film resists resin solvents during cure yet dissolves readily in water for easy cleanup .

Why Use PVA?

PVA excels where wax fails—such as first mould attempts, complex tooling, or between incompatible resin types. By forming a solvent-resistant film, it ensures a safer, cleaner, and more reliable production process, while being easy to remove and re-apply as needed .

Key Features & Benefits

• Solvent Resistance During Cure: Prevents air inhibition and tackiness in polyester, vinyl ester, or epoxy systems.

• Smooth, Uniform Film: Sprayed 12–18 inches from the mould, forming glossy, swirl-free layers .

• Water-Soluble for Easy Removal: Films detach easily, simplifying mould cleaning after each use .

• Protects Against First-Use Failures: Ideal where wax alone may fail—PVA helps avoid sticking and resin bridging.

Typical Application & Instructions

1. Surface Preparation: Ensure moulds are clean, sealed, and free of other parting agents .

2. Application Method: Spray or wipe a thin mist coat, then follow with two heavier flow coats .

3. Drying Time: Wait 15–45 minutes between coats; full dryness is needed before lay-up .

4. Film Thickness: Aim for ~25–50 µm dry film on seasoned moulds; thicker for newly sealed moulds .

5. Post-Cure Removal: Release the part, then rinse mould with water to remove residue before reapplication .

Performance Details

• Coverage: Approximately 400 ft² per gallon 

• Solvent Resistance: Withstands resin solvents once dried

• Temperature Limit: Up to ~60 °C maximum during cure