Big Paws Only Dog Forums

Our six month old Newfoundland is very mouthy.  Whenever anyone tries to pet him, his mouth is all over their hands, wrists, etc.  I have tried all the usual fixes for this -- giving him a toy to play with as an immediate distraction, saying NO BITE, stop playing with him.  We do not roughouse or play tug of war with him--all the things you're supposed to do to prevent the mouthiness.  I do reward/praise him when he stops mouthing.  He has been to a six week obedience class and di well with that, but I was wondering if anyone else has had this problem and if it eventually will stop when he gets older or if I need to try something else to stop the mouthiness.  I would like to get to the point where people can pet him without him nipping and mouthing.  He's actually has a great temperment, but this is becoming a real nuisance.