I personally always put a layer of silicone on before I foam. Besides for the foam, when I make a build for an office, an evenly applied layer of black silicone gives a nice glossy look from the outside and hides the foam and all other background items. Saves me from having to put contact paper on which could peel off down the road. Don't put the foam on to thick though. If need be, apply with multiple applications.
Quote Originally Posted by LilyPad View Post
Good luck!