This is a good product, just unfortunately my husband realized it wasn't what he needed to caulk the shower with after testing it on two pieces of stone. I am sure it works great for metal roofs.I bought the white sealant and it look like it is light gray, the biggest issue I had was how semi- cured it was out of the tube. I have used this brand in the past for my home and it was always great sealant. I am pretty sure that this was old stock that wasn’t kept at a suitable temperature.Product worked great for sealing electrical meter. Would recommendThis is the best metal roof sealant you can buy last along time and the run and weather dosent destroy it . Shipped fast and even came with a free caulk gun . Will buy again