what is wbp
WBP stands for Water Boiled Proof . If you use WBP glue for the plywood / film faced plywood, the panel will can be exposed to weather, water and moisture for a long period (some maybe permanently) without delamination. Like the word of  MR , WBP is not the name of a specific glue.
WBP is only a kind of property/feature of glue. If a glue has WBP property, the glue will can be called WBP glue. As a simple method of test for WBP plywood, you can put the plywood samples into the boiling water.