Sikalastic Moisture Seal – Moisture Barrier & Waterproofing Primer
Sikalastic Moisture Seal is a high-performance, two-component, water-based epoxy primer and waterproofing barrier membrane designed for use on damp and green concrete and cementitious substrates. It forms a waterproof vapour barrier with resistance to hydrostatic pressure and can help prevent rising damp.
Sikalastic Moisture Seal can be used as a moisture barrier and primer before compatible Sika waterproofing membranes. Its excellent adhesion to damp substrates, low VOC formulation, non-flammable properties and easy water clean-up make it suitable for a range of commercial, industrial and construction waterproofing applications.
Sydney Industrial Coatings is a Sika distributor supplying Sika waterproofing products across Sydney, NSW and Australia.
Key Features
- Two-component, water-based epoxy moisture barrier
- Suitable for damp and green concrete and cement screeds
- Forms a waterproof vapour barrier
- Resistant to hydrostatic pressure
- Helps prevent rising damp
- Excellent adhesion to damp substrates
- Suitable as a primer under compatible Sika® waterproofing membranes
- Suitable for positive and negative moisture applications
- Low VOC and non-flammable
- Easy water clean-up while wet
- Convenient 1:1 mixing ratio
- Suitable for use in confined spaces
- 20L kit containing 10L Part A and 10L Part B
Where to Use Sikalastic Moisture Seal
Sikalastic Moisture Seal is designed for waterproofing and priming applications where substrate moisture needs to be managed before applying a compatible waterproofing system.
- Damp or green concrete floors and slabs
- Damp or green cement screeds
- Concrete moisture vapour barrier applications
- Moisture barrier for green concrete and screeds
- Rendered brickwork
- Rendered blockwork
- Fibre cement sheeting
- Negative pressure waterproofing applications
- Primer beneath compatible Sika® liquid-applied waterproofing membranes
- Commercial and industrial waterproofing projects
- Construction projects where residual substrate moisture is a concern
Sikalastic Moisture Seal as a Moisture Barrier
When used as a moisture barrier coating, Sikalastic® Moisture Seal forms a waterproof vapour barrier designed to resist hydrostatic pressure and help prevent rising damp.
Sika specifies a minimum of two coats at approximately 3m² per litre per coat, with a wet film thickness of approximately 250–300 microns per coat.
Sikalastic Moisture Seal as a Primer
Sikalastic Moisture Seal can be used as a primer over suitable damp concrete and damp screeds before applying compatible Sika waterproofing membranes.
- Coats: 1 coat
- Coverage: approximately 10m² per litre
- Wet film thickness: approximately 100 microns
Always confirm membrane compatibility with Sika Technical Services before application.
Application & Mixing
Sikalastic Moisture Seal has a convenient 1:1 mixing ratio by volume. Thoroughly stir Part A and Part B separately before combining equal volumes in a clean container.
Use a mechanical mixer to thoroughly mix the components until a homogeneous liquid is achieved. Take care to avoid excessive air entrainment and only mix the amount of product that can be used within the applicable pot life.
Pot Life
- 25°C: approximately 90 minutes
- 35°C: approximately 45 minutes
Pot life is affected by temperature and site conditions. Do not use material that has exceeded its working time.
Overcoating & Curing
When used as a primer beneath compatible Sika® liquid-applied waterproofing membranes:
- Minimum overcoating time: 6 hours
- Maximum overcoating time: 48 hours
If the overcoating interval has exceeded 72 hours, Sika specifies applying another coat of Sikalastic® Moisture Seal to reactivate the surface and extend the overcoating interval.
Full cure is approximately 7 days. For full immersion or water testing, Sikalastic® Moisture Seal must cure for a minimum of 72 hours.
Actual curing and overcoating times depend on substrate temperature, ambient temperature and relative humidity.
Substrate Preparation
The substrate must be firm, clean, structurally sound and free from contaminants that could affect adhesion.
Remove dust, loose material, laitance, grease, oil, wax, curing compounds and other contaminants. Previous coatings, curing compounds or bonding agents must be mechanically prepared and washed to produce a clean, contaminant-free surface.
The surface should be smooth and continuous, with projections and rough areas removed or levelled as required.
Concrete must be cured for a minimum of 72 hours before application. Cement render and sand/cement screeds must be cured for a minimum of 24 hours.
Surface imperfections should be repaired using a suitable Sika® repair mortar.
Technical Properties
| Property | Sikalastic Moisture Seal |
|---|---|
| Product type | Two-component water-based epoxy |
| Packaging | 20L kit |
| Part A | 10L |
| Part B | 10L |
| Mixing ratio | 1:1 by volume |
| Density | Approximately 1.35 kg/L |
| Volume solids | Approximately 50% |
| Primer coverage | Approximately 10m²/L per coat |
| Moisture barrier coverage | Approximately 3m²/L per coat |
| Primer thickness | Approximately 100 micron WFT |
| Moisture barrier thickness | 250–300 micron WFT per coat |
| Moisture barrier coats | Minimum 2 coats |
| Relative humidity | Less than 85% |
| Pot life at 25°C | Approximately 90 minutes |
| Pot life at 35°C | Approximately 45 minutes |
| Full cure | Approximately 7 days |
| Storage temperature | +10°C to +30°C |
| Shelf life | 12 months from date of manufacture |
Important Limitations
- Do not apply directly over protective coatings.
- Do not apply if rain is occurring or imminent.
- Not recommended for metal surfaces as corrosion may occur.
- Must not be used as an exposed, trafficable or UV-stable coating.
- Not recommended as an efflorescence barrier for sand/cement screeds or render.
- Not suitable to be tiled over.
- Do not apply when the substrate temperature is below 10°C or above 35°C.
- Provide adequate ventilation in enclosed areas to assist curing.
- Confirm compatibility with the selected Sika® waterproofing membrane before application.
- Do not use material once the applicable pot life or working time has been exceeded.
Buy Sikalastic Moisture Seal in Sydney & Australia
Sydney Industrial Coatings supplies Sika waterproofing products, primers, moisture barriers and construction coating systems to contractors, builders, flooring professionals and commercial customers throughout Sydney, NSW and Australia.
We supply Sikalastic Moisture Seal 20L kits for commercial, industrial and construction waterproofing applications.
If you need a moisture barrier for damp concrete, a primer for a compatible Sika waterproofing membrane, or a solution for residual moisture in concrete and screeds, contact Sydney Industrial Coatings for product availability and application information.
For project-specific advice or to confirm waterproofing membrane compatibility, contact Sika Technical Services before application.
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