Analyzing the causes of this problem, there may be the following:

1. The specified glue or glue solution is not used too thick 2. The coating is uneven 3. The drying temperature is too high 4. The coating is exposed to strong light 5. The plate is stored in a high temperature and high humidity environment

The following measures are recommended:

1. Use the PP-I type PS protective rubber (manual) or PP-IIxxxx type PS protective rubber (machine use)
2. Dilute the glue properly 3. Make the glue hand-painted to make it clean and dry 4. Set the drying temperature to below 60 degrees 5. Prevent light exposure after glue application 6. Do not store in a high-temperature and high-humidity environment

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