I started using Devilbiss Spray Gun Lubricant on my do everything gun a couple of years ago when it had to be replaced due to a bad seal that couldn't be fixed even with a replacement. I have no clue whether or not this stuff will extend the life of the seals but my gut tells me it will. Reinstalling the needle feels a lot smoother is it slides through both seals and I have not had to adjust the packing glands since I got the gun despite changing between the three different needle sizes dozens of times. A bottle of the stuff costs about $15 and should last me forever.
Anyone else using gun lubricant?
John