Seems to last a long , long timeI have some left over West System epoxy resin and 207 clear hardener. They have been sitting in my garage for nearly seven years.
They might have been exposed to below zero centigrade a few days every winter. Are they still usable or have they gone beyond their shelf life?
Spot onTest a small Batch
I have had and used many types and brands of very old epoxy. The oldest used to be some Marine Tex from the sixties we used in the nineties but I am certain I have some forty year old stuff somewhere in my shop.
we have ALWAYS test first since we had our first failure.
our first failure:
My old Buddy Jim and I hosted a gathering of all the local bist. Usiness folks where chemists and salesmen from Interlux came to town and demonstrated the new 2000 epoxy. Everybody got a complimentary quart kit.
A few years ago Jim, whose eyesight is mostly gone, gave me his stash of Boat repair materials. He still had his complimentary quart of 2000 from the eighties.
I decided to use it . It didn’t cure. After a week of waiting I scraped it off and rinsed away most of the rest of it and sanded the surface again before applying new material.
the only other old epoxy failure I have had was vc teflon primer epoxy since renamed Vc performance epoxy. The catalyst turned to a solid rubbery can shaped solid.
I tried carving a ball to see how well it bounced and the ball simply broke when I dropped it.