Linseed oil paint adheres to almost all substrates and paint types, and indoors, you can paint on previously painted carpentry without worrying that the linseed oil paint will not adhere. You can paint over other paint types such as acrylate, alkyd, and varnish. However, the substrate cannot contain wax or silicone.
1. Preparation and priming
Scrape off loose paint and wash the surface with an exterior cleaning solution. Sand lightly with fine sandpaper to roughen the surface. Add 2 tsp desiccant per quart to the standard color. Mix your own primer as follows: Dilute the primer with 15% volume Gentle Thinner or Gum turpentine.
Paint a thin primer layer only on surfaces that are scraped clean. Let the surface dry for at least 2 days. Spackle any small holes and irregularities, for example with Rubinol oil putty. Wait 30 minutes and sand the spackled areas so they are even. Prime the spackled areas.
2: Intermediate application
Apply a thin and even layer of undiluted paint over the entire surface to be repainted. Let dry for at least 2 days and then lightly sand the surface with fine sandpaper.
3. Final application
Apply a thin, even layer of undiluted paint.