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Roof panels are slabs that can directly withstand roof loads. The roof panel is located on the roof of the house and is generally made of metals such as aluminum, magnesium, manganese or alloys. After the roof panel is assembled on the gable beams on the rooftop floor, the wing panels are overlapped to cover so that multiple single box roof panels do not have vertical joints that show light, forming a sloped roof with good integrity. Aluminum-magnesium-manganese alloys for roofs and exterior walls generally adopt pre-rolling coating (Coil Coated) technology, which has the advantages of good color difference control, uniform paint film, high quality stability, and environmental protection. The types of coatings generally use PVDF fluorocarbon paint with more than 70% fluorocarbon resin.