I'm trying the Minwax/Rustoleum process for the first time, and I had to do something twice before I figured out it was a good deal.

Minwax is really a pain to sand.  It balls up into these long skinny cylinders that you have to keep brushing off the sand paper, and it's never quite smooth.

I had run into this on my test block, and made some sanding sealer by mixing Polycrylic with talcum powder (just like making sanding sealer with dope).  So I got to 'that' stage in this finishing job, and I got out the sanding sealer.  Boy oh boy, what a difference!  Polycrylic alone is the same pain to sand that it always was, but if you mix it about 1:1 with talcum powder it turns into stuff that sands just like lacquer primer.

What I don't know is how much I've affected adhesion -- I may have just made myself a plane that will suffer from the "Minivan Hood syndrome".  We'll see.

But it's nice to sand...