If no gloves make sure you scrub your hands before heading to the airport. I asked security and they told me that the swipe might pick up traces of nitro compounds.
I've been found to test positive for explosives on more than one occasion at the airport. Its amazing how calm the testers are when they tell you "you have tested positive for high explosives". Last time was in the US and they just pat you down a bit because everyone knows that explosives are big and bulky and would be easily found under clothing...