Otherwise known as PVC. When Flirt was built back in 1963, SailStar used half tubes of Cardboard for underdeck support. These tubes were cut in half lengthwise and then ‘glassed into place. Over time water got into the tubes and turned them into a nasty gooey mess, but the “bump” in the glassfibre they left behind continued to do it’s job of supporting things like the cockpit seats.
Moving forwards almost 55 years, I decided to do them one better. Rather than using oak (which is expensive and hard to bend) I went down to the hardware store and picked up some 10 foot long PVC tubes 1 inch in diameter. These I then cut in half lengthwise and then epoxied into place beneath the lazerette deck to help support it and the hatch that is currently in the mail.
While only tacked into place with a single layer of ‘glass and epoxy and held up with spring clamps, I will be adding a few layers to these tubes to further “weld” them to the deck and make it more solid.