This is a real quick one.
So, a level 1 magus with a +1 weapon spends an arcane pool point; her weapon effectively becomes +2 - she gets a +1 to attack and damage from the pool point.
What happens when that same magus spends an arcane pool point with a masterwork weapon? Does her weapon go from masterwork to +1, essentially giving her just a +1 damage, or does she just get an additional +1 to attack and damage on top of the masterwork bonus?
the +1 enhancement acts just as if the weapon were made into a +1 weapon...so you keep the same attack bonus but gain a damage bonus, also it bypass DR/magic