For the price of that "razor guard" stuff you could buy 100-200 blades. After my shave I take the blade out, rinse and wipe down the razor, hand-strop the blade to get any gunk off the edge, replace and store. My blades get tossed after 2-3 shaves. I see no point in risking cuts and irritation to squeeze an extra shave or two out of a 10 cent blade.
Given the oils and also the acidity of human skin, stropping on your hand could actually lead to rust. The instructions that the person in that video quoted were also when blades didn't have the coatings that modern blades have and were also made with different materials. So "stropping" a blade would make sense back then, but less so today.
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