Extra hardener

Maybe they are far off enough to affect a 4:1 mix if you are using a small amount. We keep half pint cups around so that mixing small amounts will be more accurate. Don't try to use a quart cup to make 4oz., for example.
 
I had opened another gallon of each part 3 years ago barely using any & not getting back to till this week. Used power stir stick & drill with settled black epoxy got it stirred up quickly & mixed a test cup. Swipping a bit on a paint gun wrench & setting in sun most of day stuck good, hardened, & sanded. That was a surprise that the activator was still good.
 
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