I have been using 70-90% alcohol with success since January. No explosion yet in the encosure as some folks predicted 
I run a Hyundai Silent oil free air compressor that is produced and sold under many brands. This particular model makes 135 l/min at 8 bar and has a 24 l tank. Unfortunately it is not designed for continuous use and it got really hot sometimes. To prevent overheating I put it right under the exhaust fan of my enclosure and it keeps it around 40-45 celsius.
The sprayer operates around 2 bar and makes a little bit of mess, that is why I have the chip guards and a piece of tape protecting the rails. This is a quick and dirty solution! My coolant spray doesn’t moves up and down with the router but still does the job.
My sprayer is permanently connected to the compressor to prevent any dirt entering the air system and clogging the needle valves or the nozzle. I put a ball valve under the table to turn it on and of rather than disconnecting the hose from the compressor.
