MSDS info can be readily found on the internet (i.e., google). length of exposure can give you estimates for acute diseases, but more importantly chronic ones (like cancer) are measured over multiple exposures (shoe polishing). If I have my shoes polished at stand in lunchtime and walk back to my office and they then sit them feets under my desk - I get minor asphyxiation from the powerful smell (Kiwi polish). I often wonder what is in that stuff. When I polish them at home the smell hangs around for hours and the wife asks me why I have been polishing my shoes again...knowing all the while that I am a shoe tragic.