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Use GE Silicone II

You can use the Silicone II product made by GE to cover the foam, it is the best silicone available and is harmless once cured. I hope you are patient though since the foam is not easily shaped (when being sprayed) or covered with silicone (when dry) if you have never used this method before. Spreading the silicone so that it is competely covering the foam is difficult but possible. There are other products out there that you can use also. True the foam is waterproof when intact but when you do cut and shape the foam after it cures, pourous areas will be exposed and may allow water through. You are better off using a bicycle tire intertube or cut a piece of PVC pipe to shape your water channel and then silicone gravel to that to hide it.
 
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