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Application guide

Repair Cracks Before Waterproofing

Understand why crack type, movement and preparation must be addressed before a waterproof coating is applied.

Before choosing a product

Understand the complete application route

Understand why crack type, movement and preparation must be addressed before a waterproof coating is applied.

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
Classify the crack as hairline, non-moving, moving or structural.

Confirm the correct material and process before proceeding.

2
Remove loose edges and contaminants.

Confirm the correct material and process before proceeding.

3
Use the repair material and geometry specified for the crack type.

Confirm the correct material and process before proceeding.

4
Embed reinforcement where the system requires it.

Confirm the correct material and process before proceeding.

5
Allow the repair to cure before the waterproofing stage.

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.

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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 Fiberglass Mesh product photograph
Waterproofing & Stone

Fiberglass Mesh

A reinforcement mesh for specified waterproofing, plaster and crack-treatment systems.

Suitable for
Cementitious and compatible coating systems
Primary use
Reinforcement
View product details →
SunChem Lunaris Waterproofing Polymer product photograph
Waterproofing & Stone

Waterproofing Polymer

A polymer product for use within compatible cementitious waterproofing and repair systems.

Suitable for
Concrete, plaster and masonry systems as specified
Primary use
Waterproofing and repair admixture workflows
View product details →

Need a project-specific recommendation?

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

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Practical guidance

Repair Cracks Before Waterproofing FAQs

Can mesh alone repair a structural crack?

No. Structural movement requires appropriate investigation and repair; mesh is only one component in certain surface-reinforcement systems.

Should a crack be widened before filling?

Some repair methods require routing or opening the crack, while others do not. Follow the repair-system instructions.

Why do repaired cracks reappear?

Movement, moisture, poor adhesion, inadequate depth or an unsuitable repair method can cause recurrence.