Interior Sealer Undercoat

The perfect product for preparing new Gib® and wallboard

  • Free-sanding to a smooth finish
  • Excellent spray application properties
  • Waterbased, low odour and low VOC


Aalto Interior Sealer Undercoat is a professional quality waterbased high build sealer and undercoat for interior broadwall surfaces. Formulated to dry fast to a free-sanding film, with excellent opacity and holdout for topcoats.

  • Typical uses: interior walls and ceilings
  • Ideal for: new Gib®, plaster, interior wallboard and timber
  • Coverage: 8-10m2 per litre

Application guide

Aalto Interior Sealer Undercoat can be applied by synthetic brush, roller, or spray.

Airless spray – a 417 or 517 tip is recommended. When spraying, Aalto Ultra Premium Interior Low Sheen will need to be thinned to suit.
Rolling – a synthetic 10mm nap roller sleeve is recommended.

  1. Ensure surfaces are free from loose and flaking paint. Wash surfaces with a suitable cleaner such as sugar soap to remove any dirt, oils or grease. If any areas of mould are present, treat with a suitable mould remover.
  2. Fill any cracks or holes with a paintable filler. Allow to dry, and sand to a smooth finish.
  3. Apply 1 coat of Aalto Tradeline Sealer Undercoat and allow to dry 
  4. Lightly sand the surface and thoroughly dust off
  5. Apply 2 coats of selected finish coat

For more detailed application details, please refer to product data sheet.

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