So the machine shop messed my block up and decked it too far and I have to use a Fel-Pro shim. I ordered one from rockauto but when it showed up it has like "waves" and is not perfectly flat. Is this normal? I attached a pic of the worst part. I also was wondering if gasket sealer is needed with it. It says to use it with a gasket sealer on the package but I was always under the impression that the copper gasket sealers and stuff where kind of "snake oil" products

Thanks for any input!