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I used a tube of GE silicone in "Almond" color. Its the only place I use silicone on my boat because the color match is quite good. I apply by filling only the top of the groove, not down to the bottom. That makes getting in later much easier as you only have to cut through a thinner layer of silicone and your not bonding the entire underside of the deck plate to the hull. When I apply I fill the top section and use a soapy water to spray over and scrap away excess. That leaves the seam level or close to the deck level, color is pretty darn good and easy to remove if I want back in.