When should Master P or Primo be used

When is it time to use Masteron or Primo? I know its used for pre contest so I am assume for cutting cycles. What would be a nice stack using Master P. I prefer it over Primo

Test p with mast p is a great mix.

I think they used to use it to eliminate estrogen sides way backin the day before a-dex, letro, and aromasin.
From what i hear, it isn't too anabolic and it's expensive, but it should keep your gains hard and lean as long as everything else is dialed in...