what does smooth-on look like when it's going bad???

mine is close to 2 years old but looks the same

Part B gets quite a bit darker and smells caustic!
I own and use many different Smooth-On epoxy's in addition to EA-40 and have noticed that it's only the slow setting/long open time hardeners that go bad.

I thought it smelled strong
Part B is which one flem?
yellow or blue can?

Blue

Quote from: Flem on July 25, 2019, 07:50:08 PM
Blue

Thanks

I wondered about that to but If mine starts to smell, I mark the cans shop only & get fresh EA-40 maybe Im over cautious but if I have a failure I  know its not the Epoxy for the most part, its cheap Insurance ,I try only order what Im going to use in a 6 month period ! I wonder if you keeped it in the fridge if it would last longer ?

I have used the smelly hardener with no problems. two years old and been opened I might not trust it.

I concur with Stic, I use smelly hardener without issue. But I don't worry about the age. if it stinks, I leave the can open and if the smell dissipates in an hour or so, I use it. If it keeps off gassing or it looks like the consistency has changed, its trash.

How about 4yr. old, but never opened

Quote from: Bob T. on July 26, 2019, 12:33:36 PM
How about 4yr. old, but never opened

Only one way to find out!
If your squeamish, sent it. I'll let you know

Your right Flem, Only one way to find out! Thanks for the offer.    I'll take a pass on sending it.

I've used very old smooth on and never had a problem(knock on wood) the stuff is amazing! I wouldn't be afraid to use it. I only build bow for myself, family or friends though, If I was selling bows I might get new.