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How to waterproof a jacket?

i have an old military field jacket, the outer shell is 50% nylon and 50% cotton with 100% cotton lining. it's an awesome jacket, it's warm enough to use through most of the winter with a detachable liner, but light enough without it to use through the spring and fall without being too warm. the only problem is, it's only waterproofing is the fact that it's kind of thick so it takes a while for the water to bleed down to where it bothers me. anyone know any good products for waterproofing this thing?

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