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I have emailed Resin research but not had a reply, i have a letter of RR hardener that the lable has come off and I'm not sure if it was quick kick harder or just 2100 fast hardener. Are both resins and hardeners compatible with both resins? I remember greg saying you can mix the hardeners to get different types but will i get problems if used quick kick hardener in 2000 resin or 2100 harderner in quick kick resin? does anyone know? best regards