I agree with Ed's points. That's why I like the K&G epoxy. So far, I've repaired a mirror on my Jeep with it (so it's in the sunlight and weather), used it to seal a cracked cast iron fuel pump on my 50 gallon gasoline storage tank (outside, in the sun), sealed up a massively cracked water pump housing on a 2 hp gas powered water pump (works great now), and sealed the argon gas port on my Paragon oven (inside, but subject to about 150 F continuously when in operation). All of these repairs are at least one year old and some are several years old. Also, I have had the glue on the shelf for two years with no noticeable loss of performance. I've never used Acra-Glass but it seems to be similar from what I've heard....
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