Choose the right hardener to control the cure time of 105 Epoxy Resin at the temperature at which you will work.Select your hardener to give you the pot life you want at the temperature and conditions in which you will work. #205 Fast Hardener, mixed at a 5:1 ratio with #105 Resin, results in a pot life of 9-12 minutes at 72F, with solid cure in 6-8 hours. It has a minimum recommended working temperature of 40F. #206 Slow Hardener, mixed at the standard 5:1 ratio with #105 Resin, has a 20-25 minute pot life at 72F with 12-18 hours required for solid cure. It has a minimum recommended working of temperature of 60F. 209 Extra Slow Hardener, mixed at a 3:1 ratio with #105 Resin, results in a pot life of 20-25 minutes at 72F, with 10-15 hours required for a solid cure.Overview of Hardeners and Cure TimesHardenerResin : Hardener RatioPot Life @ 72FCures to SolidMin. Temp.205 Fast5 : 19-12 min.6-8 hr.40F206 Slow5 : 120-25 min.10-15 hr.60F209 Extra Slow3 : 140-50 min.20-24 hr.65F207 Special Clear3 : 120-25 min.10-15 hr.60FUses for Hardeners205 Fast, 206 Slow and 209 Extra Slow Hardenerswhen mixed with 105 Epoxy Resinwork well for wetting out porous surfaces before bonding with thickened epoxy. Other uses include laminating or bonding sheets or layers of materials with tight fitting joints. Applying fabrics to surfaces or laminating in molds is another use. These hardeners are also a good choice for barrier coating, where multiple coats of epoxy create moisture protection.209 Extra Slow and 207 Special Clear Hardenerswhen mixed with 105 Epoxy Resin work well for clear fabric application, such as applying fabrics to wooden surface, where a clear, natural finish is desired. They are also good for coating wooden surfaces to create a clear moisture barrier.Group SizesWe offer hardeners in "A", "B", "C" and "E" group sizes. Match the group size of the hardener you select to the group size of the 105 Epoxy Resin with which it will be used.Metering