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Only to be considered if water comes into your boat through the top of the centreboard case, or if the existing item is coming up the case with the centreboard and jamming it.
There are two materials, Sailcloth and Mylar. You can use either if you have the metal or plastic strip going down each side of the case. If not, you need mylar.
Sailcloth
This will come as two strips, each of which is a wider piece folded over. Just screw it on under the metal/plastic strips so that there is a 5-10mm overlap. Make sure the folded edges
are towards the centre.
Mylar
If you are using mylar, try to buy it as two narrow strips. It is also available as one wide strip which you cut in half yourself, but why would you want to ? The overlap should
be 3-4mm, and the shiny side should be exposed. If you are gluing it on, you want a proper impact adhesive of the variety favoured by glue sniffers. Leave about 10mm of the width of the gasket unglued (beyond the
bit which extends over the slot) to allow it to flex more easily with the movement of the centreboard. Don't fix the gasket to the boat directly at the leading edge of the slot, it needs to flex here too, but DO
glue it or fix it down somehow at the leading edge of the gasket (allow at least 30mm excess gasket at the front of the slot).
The quickest way to mess up a slot gasket is to have a rough or badly chipped trailing edge on your centreboard. The chips etc catch on the gasket as the board goes up into the slot and
take the gasket with them. Once mangled, the gasket can become useless.
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