Commercial metal roofs can be coated to add life to the roofing systems without having to replace. Aldo is a coating manufacture that Litespeed construction recommends to coat membrane roofs and metal roofs.
The less expensive coating system for metal roofs is just to coat the laps and screws with ALDO 385.
To do a better but more expensive job, a silicone top coat is preferred. ALDO 387 silicone top coating is typically what Litespeed Construciton suggests.