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Origin and Potential Causes:
Substrate not carefully prepared. Polyester material unsuitable for galvanized substrate.Too high surface temperature during forced drying. Undercured filler - too much or too little hardener.
Prevention Techniques:
Clean and sand substrate thoroughly. Follow the manufacturer's instructions for forced drying. Use proper mixing ratio of polyester materials. Ensure the hardener is thoroughly mixed.
Remedy:
Sand the damaged repair area well.Redo the repair and refinish.
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