Wood is one of the most beloved materials in interior design. When it comes time for maintenance or restoration, the eternal dilemma is this: Should we highlight the wood grain with a transparent varnish, or paint it with a covering colour (enamel/lacquer), completely changing its appearance?
This decision is not only aesthetic. It is determined by the condition of the wood, the type of furniture, and the technique required. Let's look in detail at when the scales tip in favour of covering paint and how the process is done correctly.
Transparent varnish highlights natural beauty but is "unforgiving": it shows every imperfection. Conversely, painting with an opaque colour (enamel/lacquer) is the ideal solution in the following cases:
If an old piece of furniture or a door has deep scratches or holes that have been filled with wood putty, clear varnish will make the putty look like a "patch." Covering paint completely hides these repairs, creating a uniform, smooth surface.
Materials such as MDF, chipboard, or wood with many unsightly knots (e.g., cheap pine) do not have beautiful natural grain to showcase. Here, paint (e.g., a white or grey enamel) adds luxury to an inexpensive substrate.
If you have an old, dark kitchen made of brown mahogany that makes the space feel small, varnishing will not change its character. By painting the doors with a light-coloured covering paint, the space is immediately transformed and brightened.
If the furniture is already painted with lacquer or old oil paint, stripping all the paint down to the bare wood is extremely laborious. It is much easier to lightly sand it and repaint it with a new colour.
Water-Based Enamels (Acrylic / Polyurethane): These are the modern, ecological trend. They are practically odourless, dry in 1-2 hours, do not yellow over time, and are easy to clean. They are the top choice for interior doors, skirting boards, and wardrobes.
Solvent-Based Enamels (Oil Paints): The traditional solution. They level exceptionally well, creating a mirror-like surface (especially in gloss versions), and have extreme impact resistance. Disadvantage: Strong smell, slow drying, and a tendency to yellow in dark areas.
Chalk Paints: The favourite choice of DIYers. They can be applied to almost any surface with minimal sanding or priming. They give a wonderful, completely matte (vintage) result. However, chalk paint is porous. To prevent staining, it must mandatory be sealed with special wax or clear water-based varnish at the end.
1. Cleaning and Light Sanding: Wash the wood (especially kitchen cabinets) to remove grease. Pass over the surface with fine sandpaper (e.g., No. 180 or 220) just enough to dull and roughen it (to create "tooth").
2. The Undercoat (Primer): Never apply the final colour directly to bare wood. You need an undercoat (velatura). The undercoat is a matte, thick primer that fills pores, hides imperfections, and creates the perfect base for the enamel to "hook" onto.
3. Final Colour (Topcoat): Once the undercoat is dry, sand it lightly, dust off, and apply 2 coats of enamel (with brush, roller, or spray gun), allowing the required drying time in between.
Tannin Bleeding (Catechin Migration): Many bare woods (like pine at the knots, cedar, or oak) exude tannins and oils. If painted directly with white water-based acrylic enamel, the tannins will bleed through the paint, creating brown/yellow stains. It is necessary to use a special acrylic stain-blocking primer or a shellac-based primer before the final colour.
Adhesion (ISO 2409): When painting over old, hard lacquers (e.g., melamine), adhesion is critical. The cross-cut test method is used to ensure the substrate has anchored sufficiently. EN 71-3: If the furniture is intended for a child's room (e.g., a crib), both the enamel and the undercoat must have EN 71-3 certification for toy safety.
Varnish is for "honouring" natural wood. Covering paint (enamel) is the tool for renewal, modernization, and concealing wear. Choose the right primer, sand with patience, and your old piece of furniture or door will last for decades.
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