I think we are talking about leather boots- but the question is about the 'guaranteed waterproof' boots that are not leather; but a man made material.
I have snake boots like that; and light hiking boots. Both will if you go through enough wet grass or wet snow- get your feet wet.
And although I have found an application of snowseal works- it- might not all day.
I think they are designed to allow moisture OUT- and if you clog up the fabric; the inside moisture eventually seems to open it up - and the boots leak.
My newest '100% waterproof' boots work pretty good; but not when continously getting wet...
Not sure what is going on - but its consistant with numerouse types of 'waterproof' non leather boots........
:confused: