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Painting old unpainted cementitious surfaces - in good condition


Resene Popular Paint Systems –
Concrete, plasters and cement-based substrates: training notes

This web page is an edited version of the Resene Best System Selling training notes provided to Resene staff and is provided to enable you to gain a greater understanding of the substrates and paint systems you may encounter in your decorating project. It is impossible to cover all decorating scenarios in a single document, so if you are in doubt about any aspect of your project please contact Resene for assistance.

How to paint old unpainted cementitious surfaces - in good condition

(preparation)

Note: Refer to the PDF flowchart for a visual of the steps below:

  1. Apply Resene Moss & Mould Killer.

  2. Wash down using high pressure waterblaster OR wash down using Resene Paint Prep and Housewash.

  3. Spot prime galvanised metal with Resene Galvo-One and rusted metal with Resene Rust-Arrest.

  4. Prime using Resene Sureseal.

  5. Fill cracks and voids:

    1. Cracks under 1mm, use Resene Brushable Crack Filler.
    2. Cracks over 1mm, use Selleys No More Gaps exterior formulation or similar.
    3. Holes and voids, use either Resene Jointflex or an approved masonry filler.
  6. Refer to topcoat systems flowcharts.

Old unpainted cementitious surfaces - good condition

Things to consider

Notes:

  1. Old unpainted cementitious surfaces will be contaminated with moss and mould, windblown salt and other contaminants. They will also be powdery and most likely dirty. This is why we recommend Resene Moss & Mould Killer and a thorough clean by either waterblasting or a thorough scrub using Resene Paint Prep and Housewash .

  2. We recommend Resene Sureseal because it will:

    • Hold back any salt staining that could occur.
    • Bind the surface up if it is powdery or eroded.

    While Resene Concrete Primer could be used instead, Resene Sureseal provides a ‘belt and braces‘ approach.

  3. Spot prime galvanised flaking areas with Resene Galvo-One and rusted metal with Resene Rust-Arrest or Resene ArmourZinc 120 if the rust can be removed easily.

Key accessories essential to complete the job

Add-ons – to make the job easier or quicker

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