205 Fast Hardener® is formulated for general coating and bonding applications at lower temperatures and to produce a rapid cure that develops its physical properties quickly at room temperature. The 105 Epoxy Resin®/205 Fast Hardener system forms a high-strength, moisture-resistant solid bond with excellent bonding and barrier coating properties. The mix ratio is 5 parts resin to 1 part hardener by volume. Not intended for clear coating.
There are two types of structural bonding with epoxy. Two-step bonding is the preferred method for most situations because it promotes maximum epoxy penetration into the bonding surface and prevents epoxy-starved joints. Single-step bonding can be used when joints have minimal loads and excess absorption into porous surfaces is not a problem.