Description
WEST SYSTEM EPOXY FAST HARDENER 205-B 814ML
Product Overview
205 Fast Hardener is a medium-viscosity epoxy curing agent. It is useful in a majority of bonding situations, and at lower temperatures. West System 205-B 814ml Fast Hardener produces a rapid epoxy cure that develops physical properties quickly at room temperature. Mix it with WEST SYSTEM 105 Resin in a five-part resin to one-part hardener ratio. The resulting cured epoxy is a rigid, high-strength, moisture-resistant solid. The combination of 105 Resin/205 Fast Hardener has excellent bonding and coating properties.
205 Fast Hardener is not intended for clear coating.
Pot Life at 72F (22C): 9 to 12 minutes
Cures to a solid state: 6 to 8 hours
Cures to maximum strength: 1 to 4 days
Minimum recommended temperature: 40°F (4°C)
Mix ratio: Resin 5:1 Hardener
Pre-Warm the Resin and Hardener
Cold temperatures increase an epoxy’s viscosity, making it harder to dispense, mix and apply. Warming resin and hardener reduces their viscosity so they flow easily through their dispensing pumps. To pre-warm, place the resin and hardener containers under a warming lamp or in a warm-water bath. Pre-warmed resins and hardeners will not cling as much to your mixing equipment. They’ll also blend more easily, ensuring thorough mixing. A warmer, lower-viscosity mixture flows smoothly during application and readily penetrates porous surfaces
Dispensing and Mixing Epoxy Resin and Hardener
It is critical that you dispense epoxy resin and hardener at the correct ratio. Altering the amount of hardener does not control cure speed. Instead, it creates an epoxy mixture that can never fully cure and will have greatly reduced physical properties.
300 Mini Pumps are calibrated to deliver the proper working ratio with one full pump stroke of resin for each one full pump stroke of hardener. 105/205-206 pumps deliver approximate 0.8 fl oz of resin/hardener with one full stroke of each pump.
Preparing Surfaces
Between applying coats of epoxy, prepare the cured epoxy surfaces. When coating at cold temperatures, the slower cure can result in a waxy/greasy film on the surface of the cured epoxy, called amine blush. Remove this byproduct of the curing process before you apply the next coat of epoxy. Amine blush is easy to wash away with plain water and a 3M Scotchbrite pad. Don’t let the water evaporate. Dry the surface with plain white paper towels. Don’t use rags, because they can contaminate the surface with laundry softeners and anti-cling ingredients.
Finally, sand any remaining glossy areas with medium-grit sandpaper.