I've used the Lascaux and have been very happy with it. As we all seem to know, spraying is a "fingers crossed" experience, but the Lascaux has been very consistent for me. I like their "semi-matte" finish, but they also make a matte and a gloss.
Not everyone carries it and the best price I could find was around $30. I've purchased from Cheap Joe's and Jerry's Artarama. Pricey, yeah, yikes! But it's worked for me, so I'll keep using it. It also smells pretty bad - like extra-strong nail polish. Definitely need to use with plenty of ventilation!!
I went through 4 cans for the 15 5 x 7 boards of one series, plus a diptych (2 8 x 8 boards) and a couple of 3 x 5 boards. I quit using each can as it seemed to be getting close to empty. I hate to waste any of a $30 can of spray, but I don't want to risk screwing up a board with the "dregs" of a can. I'll use the dregs on some backing boards.
Ideally, I'd spray each board 4 times, letting it dry and then rotating between coats. The nozzle puts out a nice spray that went on evenly as long as I was careful to keep the can moving. It does a nice job of smoothing things out and hiding smudges, scuffs, eraser marks and shiny pen marks.
I had issues in getting specks of dust stuck after spraying, but that seems to be a hazard that we've all dealt with. On a couple of boards, I used a black Pitt pen on the specks, but after the coat of spray over that dried/cured, there was a dull spot where I touched up the specks.
So for more boards than I would have liked, I had to hit the background with a bit of steel wool, then diluted Ampersand repair ink, then back to spraying - some boards ended up with 5 - 6 coats for this reason. In a few cases, I still had specks making me crazy, so after the steel wool and repair ink, I took a Pitt black pen and "scribbled" on the background to create a black on black pattern that disrupted it enough to camouflage the specks. One more layer of spray went on that. The pattern is visible in the right light, but it almost looks intentional
Every can of Krylon I've tried has spit and left some larger blobs, but those seem to even out with the next layer. Still, it's too risky and I'll stick with the Lascaux.
The only other spray I've used is the old Ampersand stuff and, as Cathy said, it worked great.
I haven't tried the Golden yet. I have a can of Minwax, but now I'm afraid to even try it. Maybe on something that has color and not a lot of white, it would be ok.