You drill out a rivet, not like its complicated. I would NEVER reuse thme without cleaning them. Only way to clean them properly is to drill out the rivet and separate them to clean them. Maybe its the difference between compression ratios above 15-1 but I have NEVER had an issue taking them apart and cleaning them, then using copper coat on the outer layers. I've never used a Mr Gasket or anyone else's MLS gasket except Cometic. But they will tell you to either NOT reuse them or to wipe em off and never use anything.