We need to repair a 2 foot crack in our white marble look kitchen Corian countertop and have been trying to research how to do it. Will Corian Joint Adhesive fill in the small gap in the long crack without having to clamp it? Clamping isn't really feasible due to the location of the crack. Our home was in a mass production neighborhood finished about 20 yrs ago and we have no extra piece left behind to repair it with. We know just repairing the crack will show somewhat, but can handle that compaired to the cost of replacing the countertops. We thought we could place plywood or glue a strip of corian underneath the crack to brace it. If there is a glue that will fill the crack we assume we can then sand the semi gloss counter top using the various grades of sandpaper to smooth it in.