+1 on the propellant being the smell for the canned aerosol silicone. I use several different kinds for reasons in my winery, food and non-food, wet and dry. From my nose I think it is either (from less to most odorous) butane, isobutane or propane. Once the propellant disburses, I detect no other chemical smells except with the cheap non-food safe sprays. It takes several seconds to a few minutes to clear the air. I also don’t use silicone sprays on/in my food processing equipment. I only use FDA/NSF H3 oil like the Walton’s clear USDA food grade mineral oil on internal grinder parts.
bocephus I found an inexpensive small clear plastic tub with a lid at the big orange box store that is strong enough to store the grinding head/parts/blades/plates. I think it will outlast any bag and it doesn’t matter about dripping oil inside the box.