it would, but it will dry dull. if you want a more shiny surface (which won't be noticeable under a flow of water), two part epoxy is the way to go also, if you don't get a good seal with silicone, you need to remove it and start over since siicone won't adhere to previously cured silicone. if you do it with epoxy and you don't get a good seal, you can always do another layer of epoxy. Loctite makes an excellent 2 part epoxy and it is sold at home depot, lowe's, walmart, ect.