Published : Monday, 21 December 2009 Boat bags can prevent fouling and barnacle growth. Boat bags that prevent fouling and barnacles growing on your hull have been around for a while, but have fallen out of favour because they tend to be unsightly, unwieldy, and can rub off a vessel’s bottom paint. Now the people from Sydney's BoatSaver reckon they've got the answer with their next generation boat bags - in fact, they claim one BoatSaver boat bag can reduce maintenance costs.