Effective Methods to Repair Glass Cracks at Home

Learn how to create your own glass adhesive, whether tape can temporarily fix the problem, and when a cracked windshield can prevent passing vehicle inspections—all explained here.

What should you do if a small stone causes a sudden crack on your windshield and you don't have time to visit a service center? Or if that crack spoils your view of a beautiful morning landscape?

The process is straightforward: clean the glass thoroughly, degrease it, and fill the crack with a bonding compound.

Preparing the Glass for Repair

Start by washing the glass with water and detergent, then wipe it clean with a dry cloth. It’s crucial to remove all dust and moisture from the crack to ensure strong adhesion with the glue. Once completely dry, degrease the surface using acetone, solvent, or alcohol applied with a synthetic lint-free cloth.

How to Seal a Glass Crack

Method 1: Silicone Adhesive

This is the simplest and most effective option. Apply the silicone directly from the tube or use a medical syringe to fill the crack slowly, avoiding air bubbles. Depending on the silicone type, drying takes between 12 to 24 hours. For added durability, apply a thin layer of clear varnish over the repaired area after drying.

This repair is long-lasting and resistant to water and cleaning agents.

Method 2: DIY Glue with Styrofoam, Acetone, and Turpentine

In a glass container, mix acetone and turpentine in a 3:1 ratio. Add small pieces of styrofoam to the solution—the smaller the pieces, the faster the reaction. Stir until the styrofoam completely dissolves, forming a clear, viscous substance.

This glue sets quickly, so prepare small amounts and apply immediately using a syringe or fine brush to the crack.

Method 3: Clear Nail Polish

For small or very thin cracks, applying clear nail polish on both sides of the glass can prevent the crack from spreading. Apply a thin layer and allow it to dry completely.

Method 4: Transparent Tape

In urgent cases, regular transparent tape can temporarily stop the crack from spreading. Keep some in your vehicle for emergencies. Apply tape on both sides of the crack. However, this fix is short-lived, as condensation can cause the tape to peel off overnight.

Note that taping the windshield is not a permanent solution. It protects against dust and dirt and slows crack growth but does not repair the damage. It’s important to seek professional repair as soon as possible. Meanwhile, drive carefully, avoiding rough roads, sudden braking, and high speeds to prevent further damage.

Remember: certain windshield damages can make it impossible to pass vehicle inspections.

According to safety standards (GOST R 51709–2001), cracks in the windshield area cleared by the driver’s side wiper are not allowed during inspection.

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