Haven't tried that technique! Sounds really efficient.
What I do is drip it on the board, smooth it out with the iron without any pressure at all, let it cool, then lower the heat a little bit and go over the wax again with a a bit of pressure from the iron then let it cool off again and scrape away. I've tried the crayon method but it takes too long in my opinion.
melt wax on iron and smear on the board. any wax that happens to drip from the iron to the board, i try to spread it asap before it dries. if you drip and let it dry before you iron the base, you'll be stuck ironing the thing forever in an attempt to get an even coat. then you'll be scraping for ages after
I just take the block of wax and rub it all over the board, I don't even melt it againt the iron first. After enough has rubbed off onto the board I melt it in with the iron then buff it with scotch brite, I don't bother scraping.