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Be sure they are locked in place. The way the cup holder rings work is they have little tabs the follow a groove in the cup holder and there is a position in which they should lock in place. Of course some boats vibrate more than others or their cup holder lids easily get loose. Take them off and then you'll see where the tabs should lock on the cup holders. Add the silicone there and along the groove, twist the lids back on using your palm and you should feel them get tight and stop twisting. With the silicone it should hold up to getting wet and should work for a long time.
