I'm making a mason bee hotel for my wife for Christmas. I had ordered some cedar for it but it was not going to arive in time. Consequently I have used some oak reclaimd from an old table. This will be living outside fixed to a wall. I am putting a pitched roof on it and it will not have any end grain facing up. Reading through the forum the suggestion for something like this is to leave it unfinished. I'm happy for it to fade to grey and look a bit rustic over time. I'm struggling with not putting a finish on it though, probably my OCD wanting to get the wax out at least. I don't want to put anything on it that will cause a long term need to keep refinishing or feed fungal or algal growths. So can I wax it so it looks 'nice' when I gift it, or should I fight the urge and just leave it bare wood?