danp76
Oldtimer
It's my understanding that epoxy activators last a long time...do they get weak over time, like an isocyanate hardener? If yes or no why do they or why do they not? If they do get weak, am I sacrificing a job because of this? One reason I ask is because the gallon container of epoxy activator is a great price and a big savings over the quarts. Secondly, clear coat activators do get weak as I understand it. At what point should they not be used? What I mean is realistically I have used 8 yr old clear and activator with no apparent notice in difference in sprayability, etc...am I doing a disservice to the job by doing this? Is the clear actually weaker without me knowing it? at what point, no questions asked is clear coat activator no good? I don't want to jepordize any job at the same time don't wanna throw away good activator...? as I said 8 yr old or older clear and hardener been on shelf forever and seemed to work fine...infact never had an activator go bad on me, or has it gone bad and I just don't know it? I guess my point is brand new clear will be hard in the mxing cup the next day, my old activators are also hard in the mixing cup next day...so this doesn't really tell me if the older stuff has lost strength. Any real definitive way to know? or is it just assumed not to use even if it does harden in the mixing cup?