Fix Cracked Mirrors in Just a Few Simple Steps

Cracked mirrors are an eyesore that can happen so easily. From kids horsing around to a blaring stereo, it doesn't take much for a mirror to end up with cracks of varying sizes. While the first instinct may be to just toss out a cracked mirror, they can often be repaired and restored to look as good as new again.

Fixing a cracked mirror is easier than you might think. With some basic supplies, a little time, and following a few simple steps, those aggravating cracks can be made to disappear. We'll walk through techniques to repair small and large cracks, reinforce extensive damage, and tips to prevent future cracks.

Assess the Damage

Before attempting any repairs, it's important to fully assess the extent of the damage. Take a close look at the size, location, and severity of any cracks or missing pieces. Small cracks under 3 inches can typically be fixed with basic adhesive. However, larger cracks or those with missing shards may require reinforcement with mesh tape or even replacement of the mirror.

Check for Loose Shards

Carefully run gloved fingers over the cracks to check for any loose shards of glass that could come out. Removing these first will help the repair adhesive adhere better. Use a vacuum to carefully remove any tiny slivers.

Consider Replacement vs. Repair

For minimal cracks, repair is likely the best option. But for extensive damage spanning over 50% of the mirror's surface, replacement may be necessary. Assess whether it's worth investing time into repairs or better to just purchase a new mirror.

Prepare the Mirror

Before starting repairs, proper preparation of the mirror and your workspace will help ensure safety and success.

Safety Gear

Wearing gloves and eye protection is a must when handling broken glass. Leather gloves provide the best protection against sharp edges and shards.

Clean Surface

Use a mild glass cleaner and microfiber cloth to thoroughly clean the mirror's surface. Remove any dust, grime, or debris that could interfere with adhesion.

Protect Workspace

Cover any surfaces around the mirror with drop cloths. Use painter's tape on the frame to prevent damage. Have a trash can nearby to properly dispose of any glass shards.

Repair Small Cracks

For small cracks less than 3 inches long, super glue or clear nail polish make excellent choices for quick and easy repairs.

Apply Super Glue

Put a small drop of super glue over the crack and use a toothpick to spread it evenly into the crack. Press the edges closed for 30 seconds while glue penetrates. Allow to fully cure for 24 hours.

Use Clear Nail Polish

Paint clear nail polish over the entire crack. Let dry completely. For wider cracks, repeat several times to build up layers. It will dry clear for an invisible repair.

Sand and Finish

Once fully cured, use 400 grit sandpaper to smooth any dried excess adhesive. Clean the area and inspect the repair.

Repair Large Cracks

For large cracks over 3 inches or with missing pieces, a 2-part epoxy adhesive will provide a stronger, more durable repair.

Mix Epoxy Resin

On a disposable surface, mix the epoxy resin and hardener according to package directions. Mix thoroughly until combined.

Work Into Crack

Use a toothpick to work resin down into the crack. Spread evenly with a thin scrap of cardboard to fill the crack flush.

Allow Time to Cure

Follow manufacturer's cure times, usually 24-48 hours. The repaired area can then be sanded smooth and polished.

Reinforce Extensive Cracking

For mirrors with cracks spanning large areas, reinforce them prior to filling for the strongest repair.

Cut Mesh Tape

Measure and cut fiberglass mesh drywall tape to fit over each crack. Cut several longer pieces to span larger cracks.

Adhere Tape

Mix a 5-minute epoxy adhesive and spread over the mesh and cracked area. Firmly press the mesh into place to saturate it.

Apply Additional Epoxy

Cover the mesh with another layer of epoxy. Use a plastic spreader to ensure a smooth coat. Allow the epoxy to fully cure before sanding.

Refinish Repaired Areas

Blend repairs seamlessly using sanding and refinishing techniques.

Smooth Surface

Wet a piece of 400-600 grit sandpaper and gently smooth the filled crack and surrounding area to level.

Clean and Dry

Use glass cleaner to remove any sanding residue. Allow the mirror to dry completely before refinishing.

Apply Mirror Effect Spray

Lightly spray repaired areas with mirror effect spray paint if needed to blend sheen. Follow directions to avoid drips.

Prevent Future Cracking

Take steps to prevent cracks from recurring and extend the mirror's longevity.

Add Backing

Glue clamps, brackets, or rosettes provide extra support to keep mirrors securely flush to the wall.

Use Mechanical Fasteners

Screws offer stronger mounting than adhesive alone. Attach to wall studs or hollow wall anchors.

Install with Foam Pads

Adhesive foam pads allow the mirror to flex slightly, absorbing vibrations from bumps or loud noises.

Handle With Care

Avoid striking the edges of the mirror and use both hands when moving them. Clean only with a soft cloth using gentle pressure.

Know When to Replace

While most cracked mirrors can be repaired, extensive damage may make replacement the better option.

Major Damage

Cracks spreading across more than 50% of the mirror or large missing pieces often cannot be repaired durably.

Backing Issues

Mirrors with crumbling or rotting backing material should be replaced for safety and stability.

Coating Damage

Cracks penetrating through the reflective backing cause visible distortions making replacement necessary.

Purchase Quality Replacements

Take steps to prevent future cracking when selecting a new mirror.

Appropriate Thickness

Choose the correct mirror thickness for the location. Bathrooms often need 1/4" plate glass for durability.

Safety Glass

Tempered or laminated glass resists breakage from impacts. Ideal for households with kids.

Measure Carefully

Precisely measure the existing frame or area for an accurate custom-cut replacement.

Specialized Glass

Consider treated, low-iron, or antique glass for enhanced clarity or special visual effects.

Install New Mirror Safely

Use secure mounting techniques to prevent movement or future damage.

Follow Instructions

Use all hardware and follow manufacturer's instructions for hanging mirror on desired surface.

Attach to Studs

Screw into wall studs whenever possible for the strongest mounting support.

Use Adhesive

Silicone adhesive offers a waterproof bond to prevent moisture damage and growth of mold or mildew.

Check Alignment

Verify the mirror is level and centered before fully tightening all hardware.

Fixing a cracked mirror is an easy, cost-effective alternative to replacement. After determining whether a repair is feasible based on the damage, following some simple steps will have it looking as good as new again. Paying close attention to proper mounting and handling precautions can help prevent cracks from ever occurring in the first place. With the right techniques and materials, cracked mirrors don't have to be destined for the trash.