Wow, I was surprised to see that this stuff contains Trichloroethylene which I know has a bad reputation from a health and environmental standpoint. It is a very good solvent and evaporates pretty well which makes it attractive to use, but to me there are better options.
However, I am not sure how much of a real health hazard is presented by occasionally cleaning of your guns, but if it were me I would consider alternatives. At a minimum you should wear gloves to avoid skin contact and use a fan to exhaust the fumes to the outside.
http://www.eezox.info/msds.pdf