Asbestos can still be found in many older properties across the UK, especially in garage roofs, outbuildings and industrial buildings. When in good condition, asbestos materials like cement, roofing and sheets are usually low-risk. However, it can start to deteriorate over time if not handled properly. Painting over asbestos can help seal the surface, stop fibres from being released and give your property a cleaner look. However, you should know that painting asbestos isn’t risk-free, so it’s important to follow the right safety steps.
Is it Safe to Paint over Asbestos?
If the asbestos surface is in good condition and free from damage, it is generally safe to paint, but only with the correct paint. Only ever use asbestos sealing paint or a low-solvent, water-based acrylic coating. These coatings are flexible, waterproof and UV-resistant. They help the surface resist weathering. This prevents cracking, flaking and peeling. Avoid standard or solvent-based paints, as these can react with the material and reduce the effectiveness of the seal.
Before painting, it’s important to handle the area with extreme caution. Never sand, scrape or pressure wash asbestos cement, as this damages the surface and can release fibres into the air. Simply make sure that the area is clean, dry and stable before applying a coat.
If the surface shows signs of cracks or deterioration, do not attempt to paint it yourself. A licensed asbestos professional should always assess damaged asbestos material. They will be able to advise you on the next safest steps before any coating work is carried out.
Once you’ve confirmed that the surface is safe to paint, the next step is to gather the correct materials and equipment. When dealing with asbestos, it is necessary to ensure the area is properly dealt with while protecting yourself.
Essential Equipment for Painting Asbestos
Before applying asbestos sealing paint, make sure you have all the necessary materials ready. Being well-prepared helps maintain safety and control throughout the process. You will need:
- 500-gauge polythene sheeting and duct tape
- Warning tape and notices to restrict access
- Low-solvent, water-based asbestos paint
- A low-pressure sprayer, roller or brush
- A bucket of water and rags
- Asbestos waste bags and clear polythene bags
Using the proper equipment ensures the work area stays safe and secure. Not only does this make handling asbestos simpler, but it also safeguards you and your property during the painting process.
Protective Equipment (PPE and RPE)
Even if asbestos cement is in good condition, you must protect yourself. This is important when preparing or painting the surface.
Personal Protective Equipment (PPE)
- Disposable Type 5 overalls with hood (BS EN ISO 13982-1+A1)
- Non-laced safety boots (laces can be difficult to decontaminate)
- Disposable gloves, which must be discarded after use.
Remove PPE carefully and dispose of it as asbestos waste, following HSE guidance. Never take contaminated clothing or equipment home.
Respiratory Protective Equipment (RPE)
- Use a P3-rated disposable respirator (FFP3, EN 149) or a half-mask respirator with a P3 filter (EN 140).
- Make sure your respirator fits correctly and provides a good seal.
- Never reuse disposable respirators.
PPE and RPE are your last lines of defence against asbestos fibres, so they must always be worn and used correctly. For more details about protective gear and how to use it safely, read our related guide. It covers PPE/RPE for asbestos removal.
Preparing Asbestos Surfaces for Painting
Surface preparation is everything when dealing with any kind of asbestos. When it comes to external roof and cladding, excessive exposure to the elements causes damage and cracks. Handling these areas with care is crucial to minimising the health risks of releasing asbestos fibres.
Asbestos is most commonly found on building exteriors in:
- Cement roofs, gutters and downpipes
- Cement panels or soffits
- Cement flues
Before carrying out any preparation or painting, it’s essential to assess whether the surface is safe to coat. Do not attempt to paint asbestos cement that is cracked, flaking or showing signs of damage. If the surface is in good condition, with no brittle material, it is generally safe to seal or paint over it. If you are unsure, always ask a qualified asbestos surveyor or contractor for guidance. Do this before starting work.
If the material is confirmed as stable and safe to coat, you can begin preparing it for painting. Follow these steps carefully to minimise any risk of asbestos exposure:
- Lightly dampen the surface with warm water to remove dust
- Gently clean using a soft brush, avoiding wire brushes or power tools
- Never use high-pressure washing, as this can damage the surface
- Allow the area to dry naturally before applying paint
Throughout the process, make sure you’re wearing the correct protective equipment to keep yourself safe.
Applying Asbestos Sealing Paint
Once the area is fully prepared, sealed off, and you’re wearing the correct protective gear, you can begin painting. The aim is to seal the asbestos surface, not just decorate it, so care and patience are key.
Apply the paint using a soft-bristled roller or brush for smaller areas or a low-pressure sprayer for large or uneven surfaces such as roof sheets. Never use a high-pressure sprayer, as this can damage the surface and release asbestos fibres.
- Apply thin, even layers using smooth, sweeping motions. Avoid pressing too hard or staying in one area for too long.
- Allow the first coat to dry as directed by the manufacturer. This helps the second coat adhere properly.
- A second thin coat provides extra protection and durability, locking in any remaining loose fibres and creating a weatherproof barrier.
- Make sure all joints, overlaps and edges are fully sealed before removing your protective coverings.
Painting Across Different Asbestos Surfaces
Asbestos Roof Sheets
Begin at the highest point of the roof and work downwards to prevent runs and drips. Use long-handled rollers or a low-pressure sprayer for better reach and even coverage. If roof access is required, work from crawl boards or scaffolding to avoid putting pressure on the sheets. Take extra care to seal ridges, fixings, overlaps and joints, as these areas are more prone to weather damage and fibre release over time. A flexible, waterproof paint is ideal for asbestos roof sheets, helping to protect against UV exposure, moisture and temperature changes.
Asbestos Wall Sheets and Cladding
Apply paint in smooth, horizontal strokes, working from top to bottom. Pay attention to joints and fastenings, as these areas can deteriorate faster than the main surface. If any gaps or exposed edges are visible, seal them with suitable asbestos sealant or duct tape before painting to prevent dust release.
Asbestos Cement Panels and Soffits
For smaller or detailed areas, use a brush to apply the paint carefully around corners and fittings. Ensure the surface is clean and stable before painting and avoid disturbing screws or nails that may have weakened over time.
Decontamination and Aftercare
Once the final coat of paint has been applied, allow the surface to dry completely before beginning any clean-up. Drying times can vary depending on the type of paint used, so always follow the manufacturer’s guidance. Avoid disturbing the coated area until the paint has fully cured, as this helps the seal to bond properly and ensures maximum protection.
When it’s safe to do so, carefully remove all protective sheeting and tape, folding the plastic inwards to contain any potential dust. Collect all debris, used materials and coverings and place them directly into asbestos-approved waste bags. Avoid breaking or tearing the sheeting, as this could release trapped fibres.
Clean the working area using damp rags or disposable cloths. Never sweep or vacuum, as this can disturb settled dust and release asbestos fibres into the air. All cleaning materials, including rags, brushes, rollers, disposable overalls and gloves, should be placed into labelled asbestos waste bags. Each bag must then be sealed securely and double-bagged in a clear secondary bag before being disposed of through a licensed asbestos waste contractor, in accordance with UK regulations. If you’re unsure where and how to dispose of asbestos waste, read our resource on the steps to take.
When to Contact an Asbestos Professional
If you have any doubts about the condition of the asbestos material, such as cracks or previous damage, stop work immediately. Painting or sealing should only be carried out on asbestos that is stable and undamaged. Attempting to coat deteriorating material could worsen its condition and increase the risk of fibre release.
At Smart Asbestos, our qualified professionals can inspect your property. We can carry out asbestos surveys and test materials for asbestos content in your property.
Conclusion
Painting asbestos cement can be a practical and effective way to seal and protect the material, provided it’s done safely and correctly. Using the right protective gear reduces the risk of exposure. Water-based coatings and controlled working methods also help as they extend the life of your property’s asbestos surfaces.
For reliable asbestos expertise, contact Smart Asbestos today. Our specialist team will help you manage asbestos safely. We follow UK regulations to fully ensure long-term protection for your home or business.