If the roof is covered with New Metal, You Need to Paint It 3 Times. The 2nd and 3rd Layer of Paint Apply After a Week. IT ShOULD Be Painted with A Flywheel with A Tough Stubble, and Not a Roller, OcAssionally Mixing the Paint So that it is homogeneous. The Bells of the Paint Can Be Obtained from the Rollers, and this Leads to Cracks.