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Painting previously painted over old bituminous paints / membranes


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 over old bituminous paints / membranes


(Preparation)

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

  1. Apply Resene Moss & Mould Killer

  2. Scrub using Resene Paint Prep and Housewash. Alternatively , waterblast to remove flaking paint, refer notes

  3. Spot prime exposed bitumen using Resene Membrane Roofing Primer

  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

Things to consider

Notes:

Previously painted bituninius

  1. It was common practice well into the 1970’s to waterproof concrete, masonry and concrete block buildings with a system comprising a bituminous (tar) basecoat and a waterborne topcoat – often many layers particularly of the bituminous basecoat were used. It was not until the introduction of Resene X-200 that these systems lost favour.

  2. Paints – even modern waterborne paints do not adhere well to bituminous paints – Resene Membrane Roofing Primer does. It also adheres to membrane roofing systems.

  3. The decision as to whether to waterblast or thoroughly scrub should be considered carefully. Both will clean the surface but waterblasting, particularly with high pressure will remove paint, which otherwise might not have needed to be removed.

  4. Bitumen is softer than waterborne paint and is more affected by heat. Therefore avoid mid-range and strong colours as this will cause the paint to crack and flake.

Key accessories essential to complete the job

Add-ons – to make the job easier or quicker

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