ok :  got this stuff on the jacket
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and water is beads off better than ever. the test was rather short so not sure about a soaking rain.
spray on, let dry, activate in the dryer. they say the coating is supposed to last 25 washes.

also used similar product by the same company on some packs and such
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product seems to work well, the only downside is the propellant ran out before the product. this on both cans

third product to consider:
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beading is nothing, how about rain bouncing off !