As mentioned Dicor lap sealant comes in a self leveling and a non sag version. You use the one designed for the application need. When picking a product, make sure you are picking the correct product for your application and not just a name. Names like 3M, DAP, GE, Gorilla, Sika, OSI, Henry's etc are just brand name. Those companies have a range of products; not all are appropriate for your specific needs. So, make sure you are looking first at the application and not just some brand name.