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Severe osmosis, multiple blistering, or "hull pox" is a serious condition. If the bottom of this Boston Whaler 17 is covered with blisters, filling them won't cure the problem. Pox is a systemic condition indicating that the hull is saturated. The actions necessary to remedy boat pox require specialized equipment and hull repair expertise. Hull pox is a good reason not to buy a used boat, no matter how "rare" you consider the boat.