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Application guide

Wood Crack & Joint Filling

Prepare defects, select a compatible filler and manage colour, movement and sanding before finishing.

Before choosing a product

Understand the complete application route

Prepare defects, select a compatible filler and manage colour, movement and sanding before finishing.

Site conditions matterUse this page as a selection guide. Review site conditions and current product instructions before application.

Project input for quantity guidance

Record the approximate area and planned coats, then apply the current product-specific coverage rate with allowance for texture and application loss.

Enter project details to create an estimation note.
Recommended sequence

A practical step-by-step approach

1
Inspect the defect and moisture condition.

Confirm the correct material and process before proceeding.

2
Remove dust, loose fibres and contamination.

Confirm the correct material and process before proceeding.

3
Apply a suitable filler in the recommended depth.

Confirm the correct material and process before proceeding.

4
Allow complete drying or curing.

Confirm the correct material and process before proceeding.

5
Sand, inspect and test the final stain or coating.

Confirm the correct material and process before proceeding.

Related SunChem Lunaris products

Products to discuss for this application

Final selection depends on the substrate, existing condition and complete system.

Build an enquiry list →
SunChem Lunaris Joint & Crack Fill product photograph
Wood Fillers & Stains

Joint & Crack Fill

A filling product for suitable joints and cracks within compatible repair systems.

Suitable for
Wood or other stated substrates after confirmation
Primary use
Gap and defect filling
View product details →
SunChem Lunaris ECO-STUCCO Wood Filler product photograph
Wood Fillers & Stains

ECO-STUCCO Wood Filler

A wood-filling product for repairing suitable surface defects before sanding and finishing.

Suitable for
Wood, MDF and plywood after compatibility confirmation
Primary use
Wood repair and preparation
View product details →
SunChem Lunaris Wood Stain product photograph
Wood Fillers & Stains

Wood Stain

A colouring product for compatible wood-preparation and finishing systems.

Suitable for
Prepared wood surfaces
Primary use
Wood colouring before approved finishing
View product details →
Illustration of Silicone Gun
Wood Fillers & Stains

Silicone Gun

A manual dispensing tool for compatible cartridge-applied sealants and fillers.

Suitable for
Cartridge-applied materials
Primary use
Controlled dispensing
View product details →

Need a project-specific recommendation?

Submit the surface type, current problem, project size, city and photographs.

Talk to a Product Specialist →
Practical guidance

Wood Crack & Joint Filling FAQs

Can filler hide every joint?

Some joints are designed to move and should not be treated as static cosmetic defects.

How can filler colour mismatch be reduced?

Use sample testing and account for how the filler absorbs stain differently from natural wood.

Why does filler shrink?

Solvent or water loss, excessive application thickness and deep unsupported gaps can contribute.