if there wasn't "fear" of one brand not working with someone elses,
no shop would stock or spray "sealer"
they'd just prime..
so the b/s that it doesn't matter is b/s.. as you'd skip the use of sealer and save both time and money..
anyone that says it don't matter, ask if they are spray'n a sealer coat. if they are, they were talking out their corn hole..