Yup, Jim nailed it, seal it and it should be fine. There are a few game arcade builder forums I checked with when building the photo booths. I saw several topics on that very subject and many were doing the same.
This is one of the forums... http://forum.arcadecontrols.com/index.php
Another alternative to the shellac is: 1 part glue/ 1 to 2 parts water. apply with foam brush, let dry and sand with 220 grit. repeat process, then paint/finish over that.
This is actually a pretty good thread on cabinet finishes...
To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault