There are three types of foam used, #1, a latex type, does not expand much and not good with water. #2, a minimal expanding type and MOSTURE resistant, would be so-so. #3, is a triple expanding type and is water PROOF. I could see where this practice would help, not a cure. Its simple enough, would only add 8 ounces or so. You can buy a refrigerator clear nylon water water line and slip it over the short piece that comes with the foam can, this way you can get the foam in the middle. Cover any area that the foam might drip out of the bar end onto the bike.
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