Permatex Valve Grinding Compound for Lapping & Seating, 1.5 oz.

I didn't use this for its intended purpose refinishing valves to seal with the heads of an engine. I used it to help with getting the bolt of a 1928 Remington model 11 shotgun to smooth cycle in a replacement receiver that was built in the early 1920s. Before using the compound the action wouldn't freely move back and forth in the receiver. I Placed the compound on the rails which the action moves back and forth on and using a wood dow to move the action back and forth. After 100-200 times of this the action could be moved by hand only. Removing the compound is a pita but if you don't you run the risk of wearing out components. The next item i used this compound on was a mag tube extension. The tube should had just screwed into the guns tube with no problem however it acted like the threads were tight and wouldn't screw down the whole way. After adding the compound to the threads it help remove just a little bit of the finishing on the threads and allowed the tube to be fully screwed in. one tube will probably last me forever. This stuff worked for me

The directions say to use a course compound followed by a fine compound but the tube doesn't say what grit it is. I am betting that this is course but no telling what the exact grit is. It leaves a rough surface on the valve seat. I will use rubbing compound after using this and see how it looks. There are better products on the market but I can't find them at this store.