Uncap your liquid plastic glue product and load the syringe with it. You don't need to fill the syringe completely. In fact, it's better to fill it only about one-quarter full and then reload as necessary.
Use the syringe to eject small drops of glue over the area of the glove where you want to add grip. Each dollop should only be one drop in the syringe. If you use too much, your glove will become wet and sloppy. Place each drop about 1/4 inch away from the next and continue out in a grid pattern.
Connect each drop with a thinner line of the glue to create a web. This is most easily accomplished using a safety pin or other small needle as a tool. The webbing will add to the grip's strength.
Allow the glue to dry.