Putting almost anything on them is better than doing nothing. I have had great results with SnoSeal and light amounts of Kiwi polish on a pair of Vasque Sundowners. They were worn a lot in damp grass and brush. The lighter boots, typically fabric and light leather, I protect with NikWax. Haven't really used this stuff long enough to say for sure, but it seems to work pretty well so far. The main thing is regular cleaning and treatment.