I've used it for cooking, shouldn't be an issue if it is WELL purged... either left out for a couple days after dry, or if in an oil, warmed and left to evap... personally, I run a batch of iso, let it evap normally, and then into a heated vacuum chamber for 24 hrs pulling about 24 inches of mercury. Once the isopropyl is gone it's fine. But iso can be hazardous in small amounts, thus why we stress so much. Ever clear is a much safer alternative, given that it's consumable by itself. Am sure your stuff has been ok, iso just needs to treated with more attention, and respect...