Remove the required amount of glue from the can & add the necessary hardener as direst below. NEVER put unused resin back into can. ALWAYS use separate spatula to take out resin from the can. The surface to be glued should be clean 7 dry. Strictly observe the above rules. Standard rules for mixing hardener are: Dosage: 10parts glue - 3 parts hardener Hardening time (gel time) 3-7 minutes at 25 C with 3% of hardener. Do not use hardener with any other kind of resin.