Patio table glass is painted mainly for decorative reasons. Clear glass tables often show fingerprints and what lies beneath the table may not be attractive. Glass is nonporous and so a special paint formulated to adhere especially to glass is required. This paint not only adheres to the table, but also hardens to an extent to hold up against whatever may sit or slide across the table's surface.
Spray a degreaser over the surface of the table and allow this to soak for at least 20 minutes. Scrub the tabletop with a soft dishwashing sponge until the table is clean of dirt and grime. Wipe this off with a dish rag and paper towels.
Fill a spray bottle with pure vinegar and spray the table. Allow this to soak on the table for five minutes. Wipe this off with paper clean paper towels. Rinse the table off with a garden hose. Allow the table dry completely. Wipe off any setting water with paper towels.
Set the table in an area away from surfaces you don't want to get overspray on. Wrap a painter's cloth around the legs of the table to protect them from paint. Mask off any other showing pieces of the table with 2-inch masking tape.
Shake the can of spray paint until the mixing ball inside the can rattles freely and then shake for a couple minutes to mix the paint thoroughly. Hold the can of paint 6 to 8 inches away from the surface and begin spraying in a back-and-forth motion until the glass surface is painted completely. Maintain an even speed to avoid thin and heavy spots. Allow this coat of paint to dry and paint it again and again until the finish is even across the entire surface of the table.