I use car windshield resin. You can buy an ounce online. 42.00. If you think that's a lot of money, remember you get what you pay for when it comes to bottle repair, same way with bottle cleaning. YOu can only use it in warm or hot weather. After you apply you need to cover repair with clear plastic like a baggie and set out in the sun to cure. It's the most invisible repair I've discovered; If you use it on clear glass you can't tell it was ever broken a lot of times.