Cracked glass can be a fairly easy repair, but it requires you to fix the damage as soon as you notice it so it does not continue to spread. Repairing a glass windshield is the perfect example of a small crack that spreads across the face of the windshield, getting worse and more difficult to repair.
Inspect the cracked area of the glass only by looking at it without touching it so you don't cut yourself. Put on your safety goggles to prevent glass shards from flying up into your eyes.
Remove any loose glass shards from the crack. Place the razor blade corner in the crack, and carefully pick at the loose pieces. Blow them away as well with your mouth to force them out of the crack.
Combine a few drops of liquid detergent, a few drops of denatured alcohol and 2 cups of water in the bucket. Stir with your hands until sudsy, and then soak the soft cloth in it.
Clean the glass windshield with the solution and then dry it off completely with another dry cloth.
Fill the syringe with the liquid resin. Squirt a small amount of resin into the center of the crack. It is alright if it overflows.
Let he resin dry and cure for a few hours. Scrape away the excess resin from the surface using the edge of the razor blade.