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Introduction If you are using epoxy resin for flooring, coating, casting or other applications, one of the most important things to get right is the epoxy resin and hardener mixing ratio. For the Epochem 105 Resin and Epochem 205 Hardener, the required mixing ratio is: 2:1 — Resin to Hardener That means you mix 2 parts Epochem 105 Resin with 1 part Epochem 205 Hardener. For example, 2 kg of resin requires 1 kg of hardener, giving you 3 kg of mixed epoxy. Understanding this ratio is importa …