My previous Gore-Tex boots stayed waterproof for several years, until the soles wore out. My newer Gore-Tex boots are only about 18 months old and they already leak! What is your experience with durability? Also is there a good way to make them waterproof again? Silicone spray didn't work, and most other products seem to be mainly for leather (although some mention fabric boots too). I don't want to spend much, I might be better off buying new boots.