Nope, thats perfect .. its probably the main recommended way to oil and refresh older, dull chips. Id be careful to try and not get any on the inlays/hotstamps, and just kinda rub around the edges. Not thats its a bad thing, but better to be careful I would think.

Cant go wrong, but be prepared to spend many hours doing them if you have 500pc+ sets you wanna do lol.