Put on a layer of glue on the ply edge, let it dry, then do the glue up as you would with any glue up. Wax the clamp bars thoroughly first. When the glue is nearly dry, use a scraper to remove the squeeze out. I usually apply glue to the up side of the material so the squeeze out fills in the other side, which reduces the amount of squeeze out. I also brush on the glue.
ALTERNATIVE for clear coat finishes, you can use green painters tape laid all the way to the edge of each piece to limit the amount of glue that will stick to the surface. It's hard to lay this on all the way to the edge, however, you can lay it on overlapping the edge, press it down all the way across to seal it, then use a sharp box cutter or razor blade to trim it flush to the edge. Then you brush on the pre-glue layer, let it dry and then re glue the ply and the trim. Pin nail and/or clamp while the tape is still on. Once dry, strip off the tape. The top of the self will be the best looking side and needs the most protection from squeeze out. The ultra thin outer layers can't take much sanding to remove glue. Of course, if you paint the shelves you can sand lightly and cover. But if you plan to stain and use a clear coating, then the painter's tape is a best bet.
Brushing on the glue will give you better control and less squeeze out. I buy disposable brushes like the ones shown. You can rinse them out and reuse them if you want, but they're only about a dime each in bulk. For adding edges, I put glue in a container and dip the brush rather than apply a bead and spread it. Get these brushes at Amazon or Harbor Freight.
The more I do, the less I accomplish.
Last edited by DesertRatTom; 11-30-2018 at 10:42 AM.