I have an exterior light fixture mounted on stone. Being stone, the surface is uneven. I want to seal around the fixture (top and sides, leaving the bottom open). I'm trying to determine what sealant to use. I had thought I'd use Sashco's Lexel (Clear), but then someone suggested that I consider using Vulkem (the 116 I assume, in Stone color). One consideration is how easy it is to get it. The Lexel I can get locally easily, the Vulkem (in the stone color, anyway) seems very difficult to find, and nowhere locally. So is Lexel Clear a good choice? Thanks.