Posted this on CPA web site

Flight:
Posted this on 340 section of CPA forum but should work for all

Found that if you have one of those Black Light Flashlights (30-40 bucks on internet)and shine on connections and such you can see leaks in A/C system . Invisible to the naked eye it shows up as a lime green color. Black light also works great on finding oil,hydraulic etc leaks.Wash engine down with mineral spirits -run it up and pull into darkened hanger (or throw a tarp over ) and turn on your black light (even some of those bulbs from Home Depoet) and look .

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Bill Reid PAMA>AMT>VHPA>
A&P/I.A.CPA Rigger,Pilot Boulder City,NV.BVU
"Have tools can travel"

Black Light (actually ultraviolet) flashlights are great, but if you spend $30-$40, you're getting robbed! Also useful at crime scenes looking for bodily fluids!

http://www.amazon.com/LED-Violet-Blacklight-Flashlight-7301UV400/dp/B001VZC5LA

kevbert wrote:Also useful at crime scenes looking for bodily fluids!

And hotel rooms/beds!!

I liked the one with the female detective in the room, when the lights were shut off and the black light was turned on, she lit up like a Christmas tree!
All kidding aside, Magna flux developer or any dry powder personal hygiene spray, works well for finding leaks.