I used these on a pair of tannish/greenish boots (my favorite boots!). I wore them in the rain, and they seemed to do fine. However, the spray turned my boots a lot darker. Now they're sort of a murky greenish brown. To be fair, it warns you on the label that darkening can occur. I definitely miss the old color, but I guess if I had to do it again I would, since my boots will now last a lot longer.