I've got an old barreled action that I'm going to be somewhat restoring, and since I don't have the resources to do any sort of blueing, I will be using DuraCoat (as a hobby I build scale models so I have plenty of airbrushing equipment). The only thing I was wondering was the amount. Midway sells the stuff in 4oz quantities. Would 4oz be enough to finish 1 gun (Mauser with 24" barrel), or would I need a second bottle? Thanks.