Solvent paints take 14 days to cure, varnish and linseed oil take6 months. So, when painting on an oil based surface the best advise is to rather first prime it with Universal Undercoat. Allow 24 hours for Universal Undercoat to dry and then apply Tjhoko Paint in the preferred colour.
On varnished or oil treated surfaces (not furniture polish) allow 6 months for varnish or oil to cure and only then paint.
Furniture oil needs to be removed properly using Lacquer Thinners. Wear gloves and a mask