VFI-714 is a two component, medium density, one to one by volume spray applied polyurethane foam. It is suitable for application to most construction materials including: wood, masonry, concrete and metal. All surfaces to be sprayed with foam shoul dbe clean, dry and free of dew or frost. All metal to which the foam is to be applied must be free of oil, grease, etc. Three inches should be the maximum thickness of each pass. Allow ten minutes between each pass to allow for cooling. Multiple layers can be applied to reach the desired thickness and R-Value.