I have a pair of Raichle leather boots (like the old Mountain Legends) that I use for light off trail hiking and in the winter time when snow precludes the use of running shoes. They are two years old now and haven't seen too much abuse. I sealed the seams and along the rand using Freesole and have been using SnoSeal for water proofing. However, the last two times I went out in snow, my feet got wet rather quickly. I reapplied SnoSeal before each time out. Is it possible that SnoSeal (which is also 2 years old now) degrades over time? Snow generally scrapes off sealant, but on the past two hikes, water came through at a much faster rate than expected. Thoughts?