How To Paint A Radiator

• Turn off your heating and allow the radiator to cool completely.

• Optionally, drain the radiator for easier painting.

• Remove radiator covers or valves if possible to access all surfaces.
   

Tip: Painting a cold radiator prevents bubbling and ensures even adhesion.

• Use mild detergent or degreaser to remove dust, grease, and grime.

• Rinse and dry thoroughly.

Tip: For particularly greasy radiators, consider a sugar soap solution

• Use sandpaper or a wire brush to remove flaking paint and rust.

• Smooth the surface slightly for better paint adhesion.
   

Tip: For stubborn rust, a rust converter or heat-resistant primer will help prevent further corrosion.

• Apply a heat-resistant metal primer to bare metal or rusted areas.

• Let it dry completely following the manufacturer’s instructions.

• Lay down dust sheets to catch any paint drips.

• Use masking tape to mask walls, pipes, and floor edges.

• If using a spray paint, cover the surrounding walls to catch overspray.

Brush Method

• Use a small brush for corners and crevices.

• Use a medium brush for larger, flat surfaces.

• Apply the paint in thin, even coats to avoid drips and streaks. 
   

Spray Method

• Wear a respirator mask to avoid breathing in paint particles.

• Hold the spray can 25–30 cm from the surface.

• Apply in steady, overlapping passes in a vertical direction.

• Thin coats prevent paint from pooling and provide a smooth, consistent finish.
   

Tip: Multiple thin coats are better than one thick coat, especially for cast-iron radiators.

• Allow the paint to dry fully before turning the heating back on.

• Follow the paint manufacturer’s curing time—some paints require a few days to reach full durability.

Tip: Gradually heating the radiator after painting can help the paint set evenly.

• Reattach valves or covers.

• Check for any touch-ups needed before full use.

• Dark colors may absorb more heat; ensure your paint is rated for radiator use.

• Avoid painting moving parts such as valves or thermostats.

• Regularly dust your painted radiator to maintain finish and efficiency.

• Open windows and doors to improve ventilation and protect yourself from paint fumes.