I want to re seal my barn roof. The barn was built in early 70's and it has been resealed before, but it needs it again. The roof is a metal roof and I was wondering if there is a sealer that can be sprayed on instead of brushing on. The only sealer that I have been finding has a "fiber" product in it, and the containers say roll on or brush on application. I think it was made by Kool Seal.