Hi,
I have 642-2 as well and I was concerned about this too. Mine hasn't been peeling but I read around and I think someone recommended Hoppe's Elite as less harmful to the clear coat. You might want to verify that if you're interested. If it upsets you, you can always call S&W and see what they think or if they're willing to refinish it.
But it is just a clear coat and the aluminum underneath is still anodized.
Out of paranoia I've just been using gun oil to clean and no flaking as of yet. A search of "clear coat" and "S&W642" will show lots of results but most just made me even more concerned. You've got a great gun.
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