Last week I mixed some West System epoxy and cotton flox to anchor the brass 6-32 screw heads for my Dynon mag compass sensor. The 105 Resin and 206 Hardener had been sitting on the work bench with the dispenser pumps left in the cans for 2 years plus. Shop temperature had ranged between 45 degrees F and 85 degrees F. I had to push the pumps a couple times to get the prime going. Everything worked just fine. Eight hours later the flox had set up tough and strong. This stuff works good.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD USA There was an inquiry a few weeks ago about the Storage/Shelf life of Resins. I have just received the Product Guide for the West System Store at room temperature. Keep containers closed to prevent contamination. With proper storage, resin & hardener should remain usable for many years. Over time 105 resin will thicken slightly & therefore require extra care when mixing. hardeners may darken with age, but physical properties are not affected by colour. Mini Pumps may be left in containers during storage. After a long storage, it is a good idea to verify the metering accuracy of the pumps & mix a small test batch to assure proper curing. Repeated Freeze/thaw cycles during storage may cause the crystallization of 105 Resin. Warm resin to 125 degrees F & stir to dissolve crystals. Don't forget this only applies to the West System, but may be a guide for other types. I hope this gives some guide to those who were not sure where to store the resin, or how long it will last . But as always irrespective of age etc do a test piece your life depends on it & you will sleep better at night knowing you have done all you could. Robin
