Look what my dear hubby did while we were away for the weekend.
He sealed the playhouse with Marine Oil so it looks brand new! Not an easy task - the oil is messy, sticky and not very much fun especially in the Arizona heat (it was 110 degrees).
We use Penofin and it works great. Usually only have to apply it every 2-3 years. The playhouse gets daily sprinkler spray, so it gets sealed every other year. We have had our cedar patio furniture for 7 years (out in the sun, and California winter rain), and only had to seal them twice so far.
The playhouse looks so good, I'm getting the urge to jazz it up a bit - maybe curtains, or a cute little Girly sign? So many projects - so little time.