Hello, full disclosure I'm not a professional roofer and mainly do interior remodels. I'm working on an old property I bought and a portion of it has an old low slope roof that I think is smooth BUR but im honestly not quite sure what the material is (there are few low slope roofs in my area). It doesn't leak but its sun baked and crusty looking. My question is, based on the photos, is this something I could recoat in order to extend its working life? If so, what would a suitable coating be? Thanks in advance!