Master the art of sealing plaster with Dulux – transform your walls from vulnerable to virtually indestructible with this essential guide.
Understanding Dulux Sealer and Its Importance
Dulux Sealer for Plaster is a specialised water-based interior primer designed specifically for bare plaster and powdery surfaces. This essential product plays a crucial role in preparing newly plastered walls for decoration. The unique formula penetrates deep into the plaster surface, creating a stable foundation for subsequent paint layers. What sets Dulux Sealer apart is its clever blue tint that dries clear, allowing decorators to easily track their application progress and ensure complete coverage. With an impressive coverage rate of 18m² per litre, this product offers both efficiency and effectiveness.
The importance of properly sealing new plaster cannot be overstated. Without adequate sealing, your paint finish may suffer from various issues, including uneven absorption, patchy appearance, and poor adhesion. Dulux Sealer creates a protective barrier that not only stabilises the surface but also regulates moisture absorption, ultimately extending the life of your decorative finish.
Preparing Your Space and Materials
- Essential Tools:
- Short-pile roller and tray
- Quality synthetic brush for cutting in
- Clean mixing bucket
- Dust sheets
- Masking tape
- Sandpaper (fine grit)
- Clean cloths
- Protective gear (gloves, eye protection, dust mask)
- Surface Preparation Requirements:
- Ensure plaster is completely dry
- Remove any dust or debris
- Repair any cracks or imperfections
- Protect surrounding areas with masking tape
- Cover floors with dust sheets
Assessing Your Plaster Surface
Before applying Dulux Sealer, it’s crucial to properly assess your plaster surface. New plaster typically requires 2-4 weeks to dry completely, depending on environmental conditions and plaster thickness. To test if your plaster is ready for sealing, conduct a simple moisture test by pressing a clean plastic sheet against the wall and taping its edges. After 24 hours, check for condensation under the plastic – if present, the plaster needs more drying time.
Look for common issues such as hairline cracks, efflorescence (salt deposits), or powdery surfaces. These should be addressed before sealing. The surface should feel dry and slightly rough to touch, with a uniform colour throughout. Any darker patches indicate remaining moisture.
Application Techniques for Perfect Results
When applying Dulux Sealer, follow these professional techniques for optimal results:
- Mixing and Preparation:
- Stir the sealer thoroughly before use
- Maintain room temperature between 10-25°C
- Ensure adequate ventilation
- Application Method:
- Start from the top of the wall, working in sections
- Use brush for cutting in around edges
- Apply with roller in ‘W’ pattern for even coverage
- Maintain wet edge to prevent lap marks
- Apply thin, even coat – avoid overloading
Common Mistakes and How to Avoid Them
Even experienced decorators can encounter challenges when applying Dulux Sealer. Common mistakes include applying the sealer too thickly, which can lead to extended drying times and potential surface issues. Another frequent error is not allowing sufficient drying time between coats or rushing to apply paint before the sealer has fully cured. It’s also crucial to avoid applying sealer to damp plaster, as this can trap moisture and cause future decorative problems.
To achieve professional results, maintain consistent application pressure, work in manageable sections, and resist the temptation to over-brush or re-roll partially dried areas. If you notice any runs or drips, address them immediately while the product is still wet.
Drying and Curing Process
Understanding the drying process is essential for achieving optimal results. Dulux Sealer becomes touch dry within 18-24 hours under normal conditions (20°C and 50% relative humidity). However, several factors can affect drying time:
- Temperature: Lower temperatures extend drying time
- Humidity: High humidity slows drying
- Ventilation: Good airflow speeds up drying
- Application thickness: Thicker coats take longer to dry
Aftercare and Maintenance
Proper tool maintenance and storage of leftover sealer ensures long-term success:
- Tool Cleaning:
- Clean all tools immediately after use with warm soapy water
- Rinse thoroughly until water runs clear
- Allow tools to dry completely before storage
- Sealer Storage:
- Seal container tightly
- Store in cool, frost-free location
- Keep out of direct sunlight
- Mark container with date of opening
Professional Tips for Best Results
Drawing from professional experience, here are key tips for achieving superior results with Dulux Sealer:
- Test sealer on a small area first
- Apply during optimal temperature conditions (10-25°C)
- Use consistent application pressure
- Keep a ‘wet edge’ while working
- Allow adequate ventilation throughout application and drying
Moving Forward: Next Steps After Sealing
Once your Dulux Sealer has fully cured, you’re ready to proceed with decoration. Wait at least 24 hours before applying water-based emulsion paints, and up to 48 hours for oil-based finishes. For best results, choose high-quality Dulux paints that complement the sealer system. The sealed surface provides an excellent foundation for various finish options, from matt to high-gloss. Remember to maintain good ventilation throughout the painting process and follow the manufacturer’s recommendations for your chosen paint system.
FAQ
How do you seal old bare plaster?
If the existing plaster is very porous then you can seal it before painting with a mixture of PVA and water (1 part PVA to 3 parts water. Paint this on with a brush or roller, leave to dry before painting. A good quality paint always gives the best results.
Can you use kilz on plaster?
Use KILZ STANDARD Primer on almost all interior surfaces including wood, drywall, plaster, brick, masonry and more.
Can you paint directly over old plaster?
Is it OK to paint straight onto plaster? As long as the plaster has fully dried, it’s safe to paint onto.
What is the best way to waterproof plaster?
Waterproofing compounds, such as paint-on resin, can be used to waterproof plaster walls. You must prime the walls before painting on the waterproofing materials, which must be allowed to fully dry.
Sources
[1] https://paintwell.co.uk/dulux-sealer-for-plaster
[2] https://www.dulux.com.au/paint/precision/precision-sealer-binder/
[3] https://www.ultimatehandyman.co.uk/forum1/viewtopic.php?t=5749