Originally posted by SteveB As you have a K-30 you could be the guinea pig but I wouldn't recommend it. Most damage would likely happen in cleaning it off. I think you would need the mildest solvent you can find, probably alcohol based but I would want to try it on an old unloved lens first!
I'd be a little concerned about the the solvents/propellants in the hair spray damaging the lens coatings and/or the plastics used in the construction of the lens/body. I have no data to support my concerns, just an uncomfortable feeling that it might cause some damage.
Secondly, a spray from an aersol has some surprising force behind it. This is the reason waterproof P+S cameras say not to jump into the water with the camera, but rather to lower the camera slowly into the water, That sudden impact can overwhelm whatever seals are in place. I hate to think what would happen if some of the spray should make it past the seals and end up on contacts inside the body.