Need LT epoxy? Don't have LT hardener? Or don't want to deal with the blush problem? Here's an old epoxy mechanic's trick. (Old mechanic that is, can't say about the trick...)

Figure out your batch size. Let's say it's 12 oz. total, and mix ratio is 2:1. Decant 8 oz. of resin and 1 oz. (sic) of hardener. Mix them up and let them sit for about 10 minutes. That lets the reaction start, without the danger of the whole batch cooking off. Then add the other 3 oz. of hardener, mix it up again, and go for it. It's magic.