I began the use of Badger's "Regdab" airbrush lubricant a few years ago, it was easy to apply, but I found that over a brief time it became somewhat sticky, then the brush didn't work quite as well as when originally serviced.
While talking to Don Wheeler, (a wealth of information and so helpful,) he made me aware of a "bad batch" of Regdab in the system, evidently a blending error on the part of Badger's supplier of the product. Don suggested I call Badger for a replacement, SURPRISE, the president of Badger called me right back and sent me a replacement immediately.
I cleaned and re-serviced all seven of my Badger airbrushes with the newer product, all work just perfectly now. I ran a test of the product at Don's request, three drops on a glass plate, inside testing at 72 degrees, ambient light, sample is now well over two weeks and no sign of evaporating or thickening, appears just like a freshly applied drop beside the original test.
I have no affiliation with Badger, other being a user of their products and highly satisfied with them. At a strictly personal level I heartily recommend the use of the Regdab lube, just a light film on the threaded parts and especially the needle. The needle now works so much smoother as it moves in the bearing surface, it has made a significant improvement in my ability to better handle the airbrush during the more demanding tasks, like camo outlining. Good stuff, I like it.
Patrick