Preferably air-diy unsaturated polyester resin is tlie main film-forming material,and various ultrafine calcium carbonate compounds are used as reinforcing fillers,and appropriate dispersants,anti-settling agents,defoamers and leveling agents are scientifically matched.Functional additives,developed an unsaturated polyester white primer with high compactness,low surface shrinkage,smooth and flat paint film,which can save the polishing process.The test process adopts a single comparison method to analyze the influence of construction factors such as the selection of unsaturated polyester resin and fillers,the selection of functional additives,leveling agents and anti-settling agents,and the spraying interval on the paint film adhesion and coating effect.The results show that the flexible chain stmcture unsaturated polyester resin E is used as the film-forming substance,and the fillers are scientifically compounded and used,and the functional additives are used to adjust the overall performance.The unsaturated polyester white primer paint has excellent surface performance and does not require sanding.The top coat can be sprayed,which quickly improves the construction efficiency of unsaturated polyester primer,and has a good market development prospect.