Which glue is good for coater? The quality of the glue depends on it

The glue can't be used to see, and the intuition is at most to see if there are particles, precipitation, oil stains, etc. The proportion of mixed water (fluidity), the thickness of the coating film (too thin or too thick), the waiting time, the air humidity, the ambient temperature, and the characteristics of the material to be adhered to will all affect the results. The most important thing is to "try it out beforehand" before you can measure the strength, firmness.