I make boats, fiber-glass boats, and we see that even completely man made products can and do absorb water. Point is no matter what you use as a finish it is likely that some amount of moisture will penetrate, you are simply trying to slow the process down enough to use the gun while it is exposed to the elements, then remove it from said elements when the hunt is over.<BR>On a related subject Sitka Deer, would you think that an isiothalic based resin would work as a base using MEKP as a catalyst??? Then you could finish it with whatever oil you prefer.