Our hugely popular water-based primer/undercoat/sealer.

Porter's Limeproof Undercoat Sealer is an exterior/interior use undercoat primer/sealer that can be applied to bare paintable surfaces as an undercoat sealer, or for use over previously painted surfaces as an undercoat primer prior to the application of most Porter's paints or finishes.

White in colour. Ultra matt finish.

Features & Benefits

Interior and exterior
Ultra matt
Super masking
Water based
Quick drying

Suggested Applications

Can be applied to most suitably prepared interior or exterior sufaces, including timber, masonry, plaster board, PVC piping and furniture.

Apply by brush, roller or spray.


Approximately 12m² per litre depending upon porosity and surface texture


Available in 1 litre, 4 litres and 15 litres