Draw with your blue or black Sharpie the shape and size required on heavy clear plastic about 8 mil. Lay your first over-sized layer of glass down and wet it out. Use a hair dryer to heat the epoxy & glass as you stipple with a brush,,,,or squeegee out the excess epoxy. You want all the glass wet out using the least amount of epoxy resin necessary to do so. Repeat for each layer. Use a hand held light to inspect each layer as you go to ensure the cloth is whetted out, no air bubbles, and no excess epoxy. Now when done with all your layers, cut out the shape you drew,,,,,,,you can see right through the properly wet out layers. Carry it over to whatever you are working on and wet that area out where you are going to apply your patch or whatever. (You did clean and sand that up REALLY good first with 36 grit Zircon cloth backed paper 'til it was dull and no shine ,,,,,,right?) Lay your piece in position and carefully peel off the clear plastic,,,,use a pick and paint brush to assist in peeling and pushing, stipple the patch on. Now if you want a REALLY nice transition finish,,, you will have some peel-ply fabric to lay over the patch and surrounding area. I peel-ply everything I do. Stipple that on with epoxy and heat from your hair dryer. Leave the edges of the peel-ply with no epoxy. Now leave it be until FULLY cured. When cured, grab a corner of the peel-ply and strip it off. You will be amazed at the perfect looking and structural sound patch or joint you just completed.