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Wood Fillers & Stains

Joint & Crack Fill

Gap and defect filling

Joint & Crack Fill is a ready-to-use filler for joints and cracks in wood and masonry. This flexible, weather-resistant formula fills cracks and joints with strong adhesion, delivering a smooth, lasting finish for indoor and outdoor repairs. Suited to practical users and pros, it tackles everything from wall gaps to deck splits. Pair with Lunaris ECO-STUCCO Wood Filler for complete wood restoration.

Suitable context
1 cartridge

Common applications

  • Minor crack repair
  • Joint preparation
  • Surface preparation before finishing
Product overview

Where this product fits

Joint & Crack Fill is a ready-to-use filler for joints and cracks in wood and masonry.

Key benefits

  • No mixing needed for quick application.
  • Sticks firmly to diverse surfaces.
  • Adapts to movement without cracking.
  • Resists rain, sun, and wear.
  • Smooths out for a clean, paintable look.

Selection and use checkpoints

  • Determine whether the joint moves
  • Clean and prepare the defect
  • Use the correct depth and application thickness

Pro tip

Use a damp cloth to smooth the surface before it sets for a flawless finish.

Technical information

Product specifications

Suitable surfaceWood or other stated substrates after confirmation
Primary purposeGap and defect filling
Available formats1 cartridge
Country of originIndia

Compatibility

Wood, masonry, drywall

Purpose

Crack and joint sealing

Application route

Repair, test and finishing sequence

  1. Prepare a clean, stable surface

    Remove loose material and complete the sanding or repair preparation appropriate to the substrate.

  2. Test colour and compatibility

    Use a sample or inconspicuous area before applying filler or stain across the complete workpiece.

  3. Apply in controlled stages

    Follow the current product instructions for filling, drying, sanding or colouring.

  4. Inspect before the next finish

    Confirm level, colour and adhesion before applying the approved coating or topcoat.

Further reading

Related technical guides

How to Repair Cracks Before WaterproofingRead →How to Fill Wood Joints Before FinishingRead →
Practical guidance

Joint & Crack Fill FAQs

Can Lunaris Joint & Crack Fill be used outdoors?

Yes. This weather-resistant sealant is designed for both indoor and outdoor applications, standing up to rain, sun, and temperature changes.

How long does it take to dry?

Drying time depends on temperature and humidity, but it typically forms a surface skin in 30 minutes and fully cures within 24 hours.

Can I paint over it after application?

Yes. Once fully cured, it can be painted over for a continuous finish. For best results, use a high-quality primer before painting.

Will it shrink or crack over time?

No, this flexible formula is designed to move with surfaces, preventing shrinkage and re-cracking.

Does it require a primer before application?

No primer is necessary for most surfaces, but for highly porous or glossy materials, light sanding or a bonding primer can improve adhesion.