before i got all high and mighty as a truck driver, I farmed
used to just dip new boots in old engine oil and then let excess drip off before wearing.
use to get a year outta boots
now, I use a product called AQUA SEAL
wash the boots in clean warm water
let them dry for a day on boot dryer, then spray with aqua seal and again dry on dryer for 6 hours and reapply, dry, then back to wearing.
I get 5 to 7 years out of a pair of boots