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How To Paint Friable Exterior Walls

Friable surfaces are challenging, with most paints flaking and peeling off with the substrate over time.

See below for our 4-step tried and tested method of patching and priming friable external walls using Zinsser products.

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Zinsser Paint Friable Exterior Walls Products

The Benefits

Step 1. Surface Preparation

Step 2. Patch Priming & Bring Forward

Step 3. Priming

Step 4. Decoration

More Information

Further Reading


Zinsser Paint Friable Exterior Walls Products

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The Benefits

Zinsser work with contractors to create problem-solving products that meet “real world” challenges, providing tried and tested solutions to painting problems, such as painting friable exterior walls.

Challenging surfaces to paint, friable surfaces rub away easily under gentle pressure, such as old weather (spalled) brickwork, with paint falling away with the substrate over time.

Once the surface is suitably prepared, Zinsser products quickly prime surfaces for redecoration in over 350 colours, matching existing exterior décor and company branding. It means businesses and services, such as schools, libraries and council offices, won’t be disrupted for long and soon back to their sparkling appearance.

Step 1. Surface Preparation

Before using Zinsser products ensure surfaces are clean and dry, removing anything that could interfere with adhesion of materials being applied.

Loose material can be removed by scraping or brushing with a stiff-bristled brush to a sound edge.

Moisture content should not exceed 12% prior to painting.

Any signs of organic growth should be removed and Zinsser Mould Killer & Remover used to treat affected areas in accordance with the manufacturer’s instructions, allowing to dry.

Fill cracks and any small surface defects using a suitable filler, in accordance with the manufacturer’s instructions, allowing the surface to dry before rubbing down with a fine grade abrasive paper and then removing all dust.

Step 2. Patch Priming & Bring Forward

Use Zinsser Bulls Eye 1-2-3 Primer Sealer to patch-prime bare and filled areas, in accordance with the manufacturer’s instructions, allowing an hour minimum drying time (in normal conditions).

Bring forward patch-primed areas with Zinsser Bulls Eye 1-2-3 Primer Sealer and allow to dry.

Step 3. Priming

Prime all areas requiring decorating by applying one full coat of Zinsser Bulls Eye 1-2-3 Primer Sealer, in accordance with the manufacturer’s instructions. Allow a minimum drying time of 1 hour in normal conditions.

Step 4. Decoration

Decoration of the prepared and primed surfaces can be carried out with Zinsser Allcoat Exterior Satin or Gloss, in accordance with the manufacturer’s instructions, with a minimum of 1 hour between coats (in normal drying conditions).

The paint has over 350 colours from RAL and BS for matching existing exterior décor or company branding and is designed for long term decoration for up to 15 years.

More Information

If you require more advice on painting friable external walls, give our technical team a call on 0113 2455450 (option 2) or send a message to [email protected].

Further Reading

More resources on the topic of exterior walls and surfaces:

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