An investigation was conducted on the wrinkling of the paint coating on the weld sealant, it was determined that the cause of the wrinkling was poor wetting of the paint on the surface of the sealant. Through verification of material compatibility, influence of plasticizers, baking of sealants, comparison of different formulas of sealants and cross comparison of different film thicknesses in the middle surface coating, it is found that the cause for poor wetting is the thin film thickness of the paint coating. The fluctuation of robot spraying is the main cause for the thin film thickness. However, considering reducing the cost of spare parts and reducing the risk of sagging and foaming, the wrinkling problem was ultimately solved by improving the material’s wettability and an anti-recurrence solution was proposed.

Paint  /  Sealant  /  Poor wetting