However, you had better be careful playing games with the license nazi's. You sign the form to get your license under penalty of perjury.
I don't know if masking your fingerprint is mentioned in the fine print anywhere, but it's a Class C Felony if you sign that it's complete and accurate and it turns out not to be.
I honestly did not perjure myself. I did exactly as asked...and I work with cements and putty all the time. They didn't complain that my print was dirty, and I didn't argue.
Obviously, the real test will come (or not) when they call me back and say "hey wait a minnit mr smart guy..."
At that point, then I'll have my real test for "compliance." But until then, I think I have done my tin-foilly peace of mind a great deal of good because I now KNOW that indeed they haven't tried to do anything nefarious with my print or they woulda come bitchin at me by now.