MEK - yes; know about the health risks - I'm an Industrial Hygienist (by degree, etc.) and have worked in the chemical/refinery business for a few years. Saw some scarry stuff - guys washing their tools with straight, hot benzene, MEK etc. I can't tell you the number of times I've had guys break open a line wrong and get absolutely drenched with benzene/toluene/xylene. The grossest is a coker unti - the finished product is like coal and was a very fine dust. The whole place was just permeated with this black filth. We even had special showers for the guys to wash off in before they left, but would still sweat out the coke after work when they exercised.

To bring it back on-topic; there are quite a few nasty exposures in this hobby, but not as heavy or long a duration.

I think I've got some testing to do...will let you know.