Spot touchups, at least the ones I've tried have not come out all that well. The bluing I have tried has never really matched and sometimes actually makes the gun look worse. Most of my guns are in excellent condition and don't really need touch ups but there are a few that have a little bluing loss at the muzzle and I have tried spot touch ups - when the bluing wears off (and it usually does), I just leave it alone.

If your Dan Wesson does not have a traditional blued finish (more black than blue), you might call them and ask what to use. There might actually be a paint that works better than bluing. Black might be easier to work with as far as spot touch ups go. Let us know how you make out - like to see before and after pic's.