The glue we use for laminating foil to MDF substrate is a two-part adhesive. The mixing of the two components is very crucial for proper performance. The glue itself is water base and the catalyst is solvent base. Because the bases are different the mixing of the two components is a bit difficult and must be achieved very slowly.
It takes about 15 minutes for mixing a 5 gallon bucket of the two components. The glue must be agitated mechanically and constantly while adding the catalyst at a very slow flow . We use a squirrel cage type head for mixing the material.