Here is a tip on glassing that works very good for me! First clean the surface! Next cut the glass cloth to the size needed and lay it on a piece of Saran wrap on your work bench. Mix some slow cure epoxy ( Zpoxy works good) and wet the glass until the glue goes through the weave. Next, Pick up the Saran wrap and put it on the plane, ( glass side down). Now carefully remove the Saran Wrap from the glass, Use the tip of a scrap of wood etc. to hold the glass down while you pull the wrap off. Now you can use a brush to apply a small amount of epoxy on the glass and you will have a nice smooth patch and you never even got glue on your hands!