mast prop should b run EOD. Masteron should only be ran when. 1: your body fat is less than 10% and cutting. 2: when your are on a calorie defict diet and trying to maintain muscle. As far as using it for making gains, it is pretty much useless.
I agree that masteron should be used when you're BF% is in the single digits, but it can be used effectively to help make quality muscle, muscle hardness and some nice vascularity....it is effective when added to test