You talking about the gallon can with the basket inside it? I used mine inside, when I rebuilt my carb, but my garage is well ventilated. It does have a nasty smell, and if I hadn't had a decent draft in the garage, I could see some brain cells goin' bye-bye. I did feel a bit nauseous when I caught a few whiff's, before I opened some windows. I suggest wearing gloves when you mess with it. I didn't, no matter how much I scrubbed, that stank was on my hands for about a week.