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I am looking to get into an older Boston Whaler boat in the 13ft to17ft length. I am on a limited budget and am willing to do some restoration. I am curious about what is inside the Whalers that make them unsinkable? Is this material something that could possibly absorb water? do older whalers have wood stringers and transoms? Should I be concerned with rotten wood and water logged flotation materials? In short, what do I look for when I find that whaler that has been sitting outside for the last 20 years?