Sno Seal is only really meant to work on leather, not cotton unfortunately. Cotton isn't waterproof at all and it's difficult to make it waterproof. I have the quilted Carhartt pants (non-overall version of what I believe you got) and they are water resistant, i.e. they will keep water at bay for a while, but eventually you'll get wet. It's sort of the nature of the type of garment.
They do sell the wax in a tin that you could try to rub onto your overalls to increase water resistance. I have not done this to my pants though so I can't comment on whether it works. But it's a suggestion and I've definitely thought about doing it myself. It smells like crayons.
Hope that helped.
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thanks a bunch, I know the snow seal probably wouldn't work and it would be a pain to do all of coveralls with...I think I'm gonna try some spray on stuff, I do want to try and ski in these...and I work outside in the snow in them