The PPG paint rep had told me that the way to know if it is alright to use after being opened for awhile is to take a look at the paint just after you mix the hardner in. If it starts to look in any way like cottage cheese, stop right there and throw it out before pouring it into your gun. If it mixes up like normal it will be fine. Again that's just what he told me. I have to admit, I have mixed together some PPG hardner that was probably nearing 3 years old once and it worked just like it should. But I could've just gotten lucky!
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