Apply Tape to Control Glue Squeeze-Out
Glue squeeze-out soaks into the fibers of raw wood, leaving blemishes when you later apply the finish.The usual solution for this is to clean it off with a wet rag or sponge. But too much water around the joint can weaken the bond. It's better to stick down masking tape along both edges of the joint before gluing.The excess glue will then squeeze out onto the tape instead of the wood, and you can just peel the glue away when it's dry.
Glue + Sawdust = Wood Filler
Avoid Sunken Joints
PVA glue has lots of water in it, and that water will cause the wood edges at glue joints to swell. If you plane or sand glued-up panels too soon, you could be left with sunken joints after the wood dries and shrinks to its original state. Most water-based glues reach full cure in about 24 hours, but it can take several days for swollen glue joints to shrink back to size. If you're gluing up a fine piece of furniture that you hope will become a family heirloom, wait a few days after gluing up your project before sanding or planing.