Overcoating of Mineral Oils - Disclaimer

From the Resene paint and decorating problem solver

This disclaimer applies when re-staining or painting over existing weathered stained timber, or factory finished window or door joinery, that has been supplied with a clear or coloured mineral oil sealer.

Background

If the timber has been previously coated with a mineral oil (wood oil), then subsequent overcoating with a semi-transparent wood stain or paint coating may pose a potential issue.

Mineral oils, commonly known as ‘wood oils’ do not dry. Such products are Wood-X Cedar Oil, Drydens Wood Oil, CD50, CD 50 Extreme and other mineral oil based materials for exterior use.

Though the timber surface can appear dry and weathered it may contain oil inside the fibres below the timber surface. Subsequent painting (solid paint system) or staining (Resene style penetrating exterior wood stains) may at first appear to be successful, however, if the oil migrates to the surface due to sun, temperature or another cause, then this may lift the applied coating or appear as darker or shiny areas on the applied coating.

There is no simple way to tell if the wood has been previously treated with a mineral oil except to know the coating history of the structure. Homeowners may need to contact previous owners to establish if mineral oils have been previously used.

Disclaimer

Resene Paints Ltd will not accept responsibility if mineral oils have been previously used resulting in problems with the newly applied Resene coating system.

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