The mil depth gauge (wet film gauge) tool can be used to properly measure and assess the film thickness of L.D. Davis protein glue.
To use the mil depth gauge, place it directly along the glue roller to determine if the glue is running too thick, or too thin. The notches on the tool will help you determine how much glue is being applied to your substrates.
Proper glue film thickness for L.D. Davis protein glues is about 1-2 mils.
It is very important to accurately measure protein glue film thickness, as glue running too thick or too thin can lead to product or equipment issues.