The cylinder on my S&W 337PD has always turned hard. Not free and loose like others. So a drop of CLP was applied now and then. Never seemed to help. Cleaning the area with hoppe's no 9 solvent, keeps bring out this pasty looking stuff. Having 2 bottles of CLP, i go to pour the older into the newer bottle. The same pasty grease is inside the neck of both bottles. After shaking the bottle, it still remains. I know from years of use that CLP will build up like dried heavy oil. So any excess is wiped off. CLP is still good for long term storage. Always remove CLP from the bore before firing. Teflon does not work well at high temperatures.