|dad going to town with the sprayer|
I used a latex concrete stain recommended by the paint department, it was around $25 for a gallon. I thinned it half water half stain so it wouldn't gum up the sprayer, and we still had GREAT saturation even on one coat. The concrete blocks soaks it right up, so by the time we finished the last bed the first was dry. I wanted it to be super saturated so we did three coats total - and spent maybe half an hour with it.
I LOVE my teal raised beds! THEY'RE SO PRETTY AND TEAL OMG
(and major props to my dad for "helping" me stain the beds... and by helping I mean he totally did it for me while I pointed and took pictures)