Do wooden hot tubs leak?

It is quite likely you will experience some leakage from a brand new tub.  Given time the water will cause the wood to expand and this will close all the joints resulting in a watertight finish.  Spruce can take 3-5days to swell up and seal up and larch can take over a week.  It is recommended to start filling up the tub with water when your delivery arrives to avoid shrinkage (especially in summer).