If your desired method puts your mash pH in the proper range, I'd say go for it. I've never used the primer because I build up my water and use Bru'n, but it should def get you to the desired end effect of where you want your beer to be.
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Coconut Coffee Stout, American Lager, Cream Ale
Flander's Red, Blackberry Lambic, Raspberry Lambic