Park anti seize all round, it's greasy enough for nipple rim interface.
Yep, did this. Lesson learned: more = betterer. First time I just barely coated the threads and they started to bind / windup when partially tensioned. Unthreaded, added a big goop of lube to every spoke and wound it back in. Much better after that.
Anyway, first wheel build. DT xr331 28/32h on Novatec with Sapim Laser spokes to make things difficult. Also used the alloy squorx nipples & washers that came with the rims. Used a cheap stand and a knockoff tension meter which I don't entirely trust except as a relative tension indicator. I assume it's off by 10 or 20% in absolute terms.
Going to ride them with tubes for a while in case (who am I kidding, definitely when) I need to make adjustments. 42c tires mounted tubeless won't fit in my stand.