Sucking cyanide ain't fun. Conventional guns were invented in the dark ages when paint was paint and not invented in a modern day chemistry lab. New "paint" is the result of chemists inventing shinier, tougher, longer lasting paint. The toxic ingredients necessitate safer technology, not tree huggers. That is common sense. Toxic fumes results in Cancer and death. Pretty final. HVLP cuts down on the toxic overspray. If tree huggers had anything to do with new application technology, then good for them. When your paint won't lay down and flow it needs to be reduced not blasted on. By the way reducer is relatively cleaner than cyanide based epoxy.