Resin Properties

• Resin Name: 635 Thin Epoxy Resin
• Resin Viscosity: 600 cps
• Resin Type: Low-viscosity laminating epoxy
• Finish: Semi-clear, low-amber cure
• Applications: Laminating, coating, carbon/Kevlar layup, sealing porous substrates
• Penetration: Excellent due to thin syrup-like consistency
• Mix Requirement: Must be combined with hardener (included in all kits)

2:1 Slow Epoxy Hardener

Designed for maximum working time, high temperatures, humid conditions, and large laminations.

• Mix Ratio: 2:1 by volume
  Pot Life: 35–40 minutes @ 80°F
  Set Time: 5–6 hours
• Dry Time: 24–28 hours
  Characteristics: Slow, non-blushing; long open time; ideal in warm climates
• Notes: Not recommended below 70°F unless long cure time is acceptable

3:1 Medium Epoxy Hardener

General-purpose hardener suitable for most applications. Excellent for fiberglass and carbon/Kevlar laminations.

• Mix Ratio: 3:1 by volume
• Pot Life: 20–25 minutes @ 80°F
• Set Time: 3–4 hours
• Dry Time: 8–10 hours
• Characteristics: Balanced working time; most popular choice
• Notes: Ideal for typical shop temperatures (70–85°F)

4:1 Fast Epoxy Hardener

Best for cooler temperatures or when a fast cure is needed.

• Mix Ratio: 4:1 by volume
• Pot Life: 15 minutes @ 80°F
• Set Time: 1–2 hours
• Dry Time: 3–4 hours

Characteristics: Fastest curing option; creates a slightly more rigid laminate

• Resin Type: Orthophthalic Polyester Laminating Resin
• Brand / Grade: Silmar 249 (Clear)
• Color: Water-clear
• Viscosity: ~650 cps @ 77°F (25°C)
• Gel Time: ~16 minutes @ 77°F with 1% MEKP
• Cure Characteristics: Medium reactivity; tack-free surface when used with surfacing wax
• Mix Ratio: 1% MEKP (10 cc per quart / 40 cc per gallon)
• Density: ~1.11 g/mL
• Shelf Life: ~6 months (stored in a cool, dry place)
• Packaging: Available in ½ pint, pint, quart, and gallon cans