I don't have a Primo, but I did buy some Primo glove butter. It is a pasty wax, and I only used it on the inside of a glove. Since it isn't a new glove though, I can't really tell you how it would break in a glove. I plan to use it on my backup glove (after I finally finish relacing its Trapeze Web, which is killing me).
I will say this, the glove butter is very expensive (about $20 is what I paid) but it is a very large container compared to the Wilson sized conditioner container.
I'm a big proponent of Franklin glove foam conditioner, which doesn't seem to weigh gloves down, if you want a less expensive option.
Alas, my glove is better than my game.
Gamer and most prized possession: Nokona Buffalo personalized with my name in script AMG175BF
The "Backup": 2009 Rawlings black GG12XTCB