Because this is a natural product and derived from animals rather than plant material like most other nut oils and such, I have found that it will not grow mould in the soft grain as plant based oils will. Although I know that can be somewhat over come by adding vinegar to the plant based oil mixture.
As you will see on the sites it has many uses and is widely used in all sorts of industries and some harsh conditions so for what we want it is a very good solution that also saves you the cost of having to glass your board and saves the weight that comes with that. A wooden board with a lanolin coating would have to be one of if not the "greenest" method of building a surfboard that I know of. I came to using this method from my early years growing up in New Zealand and seeing the timber in sheep shearing shed and yards buffed up with years of sheep rubbing up against them. The lanolin from their wool waterproofed the timbers some of which are hardwoods for many many years.The same here in Australia and most all timber used here for shearing sheds and yards would be hard woods. So using Paulownia as I do I get a greater penetration of the oil and so a storage of the oil within the timber meaning it last quite some time between coats. The only other feedback I have had is that when it is used in cooler waters it takes a little longer to become sticky.
If you have any other experiences using Lanolin, please let me know.