Making Kayak Hatch Gaskets from Silicone

Kayaking is brand new to me, and so I don't know much about it, or kayaks.  So when I posted about my new-to-me sea kayak on one of the canoeing forums, people pointed out that this kayak originally came with neoprene hatch covers, and the firberglass covers went over that to make a tight seal to prevent water infiltration.  I did not have neoprene covers nor any reasonable means to make them, so I improvised a gasket with a tube of silicone and some kitchen cling wrap.  All-in-all I'm pretty pleased with how it turned out.  Of course as always the proof of the pudding is in the eating, so we won't know how well it works until we get it on the water.  So I'll report back after we've taken it for spin.