Maybe Jay (Resinhead) can shed some light?
First I've heard of it?
I'll see if I can get a bucket or two of it. We can spackle Plaskett Creek
Maybe they just added primer to fast-n-final.
Speaking of adding something to spackle, I added a “tiny” amount of latext paint to mine. Wow, did it spead NICE. It completely changed the way it behaved. Maybe I discovered why people love Futures in spackle. I never got around to trying Futures. Oops.