I've got a pair of 4 year old Lowa Renegade's that have been amazing. Taken me to some great places, hundreds of miles on them. But I need to re-waterproof them before a November mule deer hunt in CO. What has everyone used successfully? Should I seam seal them as well? I haven't had them leak yet, even standing in mountain streams up to my ankles, but I'd like to make sure that doesn't happen come hunt time. Cheers!