The precautions for increasing the performance of waterproof cardboard are as follows:
The PH value of waterproof adhesives must be controlled within the prescribed limits.
Must be heavier than normal paste;
When producing cardboard, use as much heat as possible.
Surface paper moisture should not be too high;
Must have more agitation, and the waterproof binder in the tank should be used as soon as possible.
If the effect is still not good, the only remedy is to add more resin.