What causes peeling in tape tests? Understanding the grid pattern and pre-treatment.
When tape is applied to the grid and then removed, the coating comes off. The way it peels can help identify whether the cause is due to degreasing, chemical treatment, or baking.
When the tape was removed during the grid test, the paint film came off with it. There are hints about the cause in the way it peeled off. 【First, please look here】 □ The base metal is visible as is → This indicates poor adhesion with the material. Suspect degreasing or chemical treatment issues. □ Only the primer remains, and the topcoat has come off → This indicates poor adhesion between layers. Suspect the interval between coatings. □ The corners of the squares are chipping and cracking finely → This is due to overbaking, making the paint film brittle. 【Why distinguish these issues】 Whether the peeled surface is the base or between paint layers changes the process that needs to be corrected. Changing the paint without examining the peeled surface will not improve adhesion. 【Countermeasures you can implement starting today】 1. Take a photo of the peeled surface and record which layer it came off from. 2. If it's the base, review the pretreatment; if it's between layers, reconsider the drying time. 3. If overbaking is the issue, compare the furnace temperature and time with your records. 【Free materials】 You can download a guide summarizing how to distinguish and address painting troubles for free from the related catalog on this page. Eiwa Kogei offers services from zinc phosphate chemical coating to baking paint.
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