My local Menards must have had some really old stuff. I opened the second gallon that I purchased at the same time last year for a different outdoor project that I have still not gotten to. It was unopened, when I poured it into my mason jar it came out already partially separated. It took a few minutes but I had about 4" of clear liquid at the bottom and about 1 1/2" of a thicker darker more solid liquid at the top. Also this can had tons of debris floating around in it. It looked to be rust particles from inside the can?