Water stains on ceiling

You may have to get a ladder, assuming you don't have one tall enough. You could decorate the rest of the wall with more smoothie but painting would probably be the best bet. :) If you do paint, test on some lower stains first and give them at least a day to see if the stains bleed through the paint. It would be safer to just use some Kilz primer to seal the stain spots before repainting the wall.

Polyurethanes are fine since they're on all furniture & all the kids are plastic poisoned anyway, but the poly's don't last to long outdoors. I'm a huge fan of One Time Wood Protector & it's completely different, lasts much longer & just needs to be re-coated & not stripped or sanded at the end of it's life. But, it's UV cured so the Sun has to bake your awesome project for a week before use & abuse.

Of course, ask One Time about your intentions & concerns...it's got an unlimited shelf-life so you just keep it & use it as needed. I've only used it on a 2-car garage door & multiple outdoor furniture items & I stopped licking & chewing on non-food products a few years ago, so I can't speak to its flavor or ingestion effects. Though, I was tempted.