Re: First centerboard vs. rock experience
I can't add much to Michael K.'s post but I have just been doing some fairly major fiberglass deck work on my old, dinged up boat.
For a repair of such a small area you may or may not be adding fiberglass cloth. The silica thickener agent should be enough to repair the ding.
I successfully used some pieces of flashing (flat metal that is used on house roofs etc) to make a mold for a flat surface I was filling with epoxy. Making a mold that conforms to the shape of your repair should save on the amount of sanding needed to be done once the epoxy cures (1 day).
Someone else suggested they used tin foil as a release film with epoxy. I'd probably opt for the heavy duty foil over the regular stuff.
Also, some plastics, like the stuff they use to make gallon containers of milk etc., do not adhere well to epoxy and can be used to make pieces of a mold.
Welcome to the wonderful world of ... boating.
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