Polyester Finishing Resin

Polyester Finishing Resin
Wrap up your project with a smooth, professional finish using UltraMarine's 100% Orthophthalic Polyester Finishing Resin (with wax). Designed as the final layer, it cures hard and tack-free—so you get a clean, sandable surface without any extra steps. Whether you're sealing fiberglass or adding that final protective coat, this resin makes it easy to get great results.

Features & Benefits:

• Tack-free finish – Wax additive rises to the surface, creating a fully cured, non-sticky layer

• Smooth, sandable surface – Ideal for prepping before painting or polishing

• Strong, protective coating – Adds durability and seals fiberglass effectively

• Easy to apply – Wets out evenly for a consistent finish

• Time-saving – No need for additional sealing coats

• Versatile use – Great for repairs, sealing, and final coats on composite projects

Technical Details:

• Resin Type: Orthophthalic Polyester Finishing Resin

• Catalyst: MEKP required (included)

• Mix Ratio: Typically 1–2% MEKP by weight

• Viscosity: Medium-low for good flow and surface leveling

• Gel Time: 30-40 minutes depending on catalyst ratio (1%) and temperature

• Cure Time: Tack-free in 2 hours at 176 F; full cure within 24 hours

• Finish: Hard, fully cured (non-tacky) surface due to wax additive

• Compatibility: Suitable for use over fiberglass mat, cloth, and laminating resin layers

• Application Methods: Brush, roller, or pour

• Application Temperature: 65–85°F (18–30°C) recommended

• Shelf Life: Up to 6 months when sealed properly and stored in a cool, dry place