You should fill the lines with beer before you ice the cooler. Then add ice and water, not just ice. You can also put foam pipe insulation on the jumper line to keep the beer from warming on the way to the box. If you just brought the keg to the party you will always get foam for the first few pours, but the logner you wait between setup and pouring the less there will be.
"If you tap it, they will come."
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