Custom-fit roller tray for small rollers

I do quite a bit of laminating and, for applying adhesive to a large area, I prefer to use a 3"-wide trim roller rather than a standard-width paint roller because large roller covers soak up-and waste-a great deal more adhesive. Unfortunately, small roller trays can be expensive and hard to find. My cheap, disposable solution to this problem is a half-gallon milk carton cut at a slant, as shown.

The carton acts as a disposable liner for a box I built from hardboard scraps. The angled base of the box holds the carton liner in the proper position so that it forms a reservoir, just like a paint tray.
—Frank Penicka, Mount Pearl, Newfoundland