I am looking at building a new bass case for my Fender p bass (1994). I want to build it out of pallet wood. I understand that I am making a difficult task for myself, however, I think it would be interesting. I know the dimensions that I want to use, and I think it is doable, however, my largest concern is sealing the case so that it is better for weather conditions, ie, so that it would not leak in wet weather etc. Any suggestions for a sealant that would work?