I was originally going to use spray lacquer for my speaker cabinets which are essentially large cubes. However, I've switched to brush on Poly. Is it possible for me to apply the poly on the vertical surfaces? If not, when will the poly be dry enough for me to turn the box so the poly surface will be vertical.
Example: Perhaps 1 side wait 30 minutes, turn and do another side? At some point with that method, I'll need to rest the box on a poly'd side, how long would that side need to cure before resting the box on it's side while the newly poly'd side dries?