How to Assess the Damage
Look closely at the line:
- Does your fingernail catch on it? A crack usually catches; a natural fissure is smooth.
- Are the two sides level? If one side is higher, the slab may have moved.
- Is it growing? Mark the ends with a pencil and check over a few weeks.
- Where is it? Cracks often start at sink cut-outs, hob cut-outs and seams.
What Is the Difference Between a Crack and a Fissure?
A fissure is a natural feature — a mineral boundary or healed fracture that formed with the stone. It does not weaken the slab significantly.
A crack is a separation caused by stress, impact, poor support, settlement or thermal shock.
How Do I Know If I Should Repair the Crack?
Repair is recommended if:
- The crack is visible and catches dirt
- Water can seep in
- The crack is near a sink or hob
- You want to prevent it spreading
If the slab is moving or the crack is wide and growing, the underlying support must be fixed first — call a professional.
How to Repair Hairline Cracks and Small Chips
Materials You Will Need
- Clear or colour-matched epoxy
- Granite dust (from an offcut) or tint
- Isopropyl alcohol
- Masking tape
- A razor blade
- Fine polishing pads
Step 1: Collect Granite Dust
If you have an offcut of the same granite, gently grind or sand it to collect fine dust. This helps colour-match the repair.
Step 2: Clean the Crack
Clean with isopropyl alcohol and let it dry completely.
Step 3: Tape the Area
Apply masking tape on both sides to protect the surface.
Step 4: Mix the Epoxy
Mix epoxy and hardener, then add granite dust or tint to match the colour.
Step 5: Fill the Crack
Work the epoxy into the crack with a thin blade, slightly overfilling.
Step 6: Cure
Allow it to cure as directed.
Step 7: Scrape and Polish
Remove the tape, scrape the excess flush with a razor blade held flat, and polish with fine pads.
Step 8: Seal
Reseal the area.
When to Call a Professional
- Cracks wider than a hairline
- Cracks across an entire slab
- Moving or uneven slabs
- Cracks on premium or exotic granites
FB Marble assesses and repairs cracked granite in Lahore.
Talk to FB Marble
FB Marble & Granite has supplied and installed natural stone across Pakistan since 2001. Visit our showroom at 51 Y Jamun, Bedian Road, near the DHA Phase 5-6 Interchange, Lahore, or WhatsApp +92 323 4148908 with your measurements for a free quote. Browse our granite, marble, quartz, porcelain and onyx collections on fbmarble.com.
