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Painting previously painted 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 previously painted cementitious surfaces - in good condition


(Preparation)

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

  1. Treat moss and mould with Resene Moss & Mould Killer

  2. Thoroughly wash using Resene Roof Wash and Paint Cleaner

  3. Spot prime any bare flaked or cracked areas

  4. 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
  5. Refer to topcoat systems flowcharts

  6. Previously painted - good condition

Things to consider

Notes:

  1. Typically repainting a sound paint system that has been applied over a cementitious surface is straightforward, because the substrate is inert and doesn’t usually cause any stress on the paint, unlike substrates like timber. As a result there are generally only three areas that need addressing:

    i) Mould and moss will need to be killed and removed – use Resene Moss & Mould Killer.

    ii) While the surface may be power-washed it is easier to clean using Paint Prep and Housewash. This is much more effective at removing surface chalking (old oxidised paint) from the old paint than waterblasting.

    iii) Any cracks or holes that need filling may need either an application of Resene Brushable Crack Filler or a suitable filler, such as Selleys Masonry Filler.

  2. While sealants are unlikely to be needed on the concrete or cementitious substrate itself they may be required at the interface between the substrate and window flashings etc.

Key accessories essential to complete the job

Add-ons – to make the job easier or quicker

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