Skimming isn't 100% necessary unless you overcooked / boiled it but don't quote me on that :-) i don't take any responsibility lol but would defo get new gasket. And if this is the first time the engine has been apart the stretch bolts "should be ok for one more go" not recommended though. If you need any genuine parts go through idworkz as he can get them cheaper and posted for less than i can get them at my local.