Yes, Acrymax coatings can be applied over asphalt flat roofs. If the roof is in good condition, 2 coats of Acrymax will protect the roof from UV degradation. If the roof is leaking or is in poor condition then a fully reinforced membrane system using Poly-1 Fabric should be used. On asphalt shingles, Acrymax coatings can extend the life of the shingles if the coatings are applied before the shingles become brittle or the edges curl.