I've started painting the desk, Behr semi-gloss oil based that goes on like silk. No one but the builder of course would do this, but when looking across the painted desktop at a low angle, the rivulets [brush marks] and valleys are plain to the eye. My brush isn't a Purdy, likely the next down scale, and with the top only measuring 40" wide, I tried to brush it in one pass, then returning over once to make it even.
Likely it'll smooth out a bit when dry in a few days, very humid here now, but would a few passes with some 400 grit sandpaper in a wood block maybe help this? From above casually it doesn't look terrible, and I realize I'll never achieve a spray-on look, but I think this could be improved.