Can you paint a VELUX frame?

VELUX has made roof windows in two internal finishes for years, and they behave very differently under a brush. Knowing which one is above you decides the whole job, so start there before you buy anything.

The white finish is a moulded polyurethane skin over a timber core. It is smooth, glossy and completely non-porous, which is what makes it wipe-clean in a kitchen or bathroom and also what makes fresh paint slide off it if you skip the preparation. The natural finish is lacquered pine, so you can see the grain and it has a honey tone from the clear coat. Pine behaves like any other painted joinery once the lacquer is keyed back.

To tell them apart, look at the type plate on the top edge of the opening sash. A model code beginning GGU is the white polyurethane; GGL is the lacquered pine. If you cannot read it, trust your eye and your fingertips: a hard, unbroken white surface with no visible grain is the polyurethane, and anything showing timber under a warm lacquer is the pine. Photograph that plate before you cover it up, because the code tells you the exact size and generation of the unit and you will need it later for blinds or glazing.

This is the part people rush, and it is the reason so many painted VELUX frames end up peeling in strips a year on. Overhead frames get handled, breathed on and rained on through an open sash more than a wall window ever does, so the bond has to be sound.

• Clean and degrease. Wash the frame down with sugar soap and let it dry. Cooking grease, nicotine and the fine residue left by condensation all sit invisibly on that surface and will stop paint gripping.
• Key the surface. Go over it with a fine abrasive, around 240 to 320 grit, until the sheen is gone and the surface feels matt. On the polyurethane this is the single most important step, because you are giving a slippery coating something to hold onto. On pine you are cutting back the lacquer to bare a little timber.
• Dust off and mask. Wipe away every trace of sanding dust with a slightly damp cloth. Then mask the glass edge, the handle, the hinges and every rubber seal with low-tack tape.
• Prime for the material. The polyurethane needs an adhesion primer made for glossy plastic surfaces, not a standard wood primer, or nothing above it will stick. Bare or sanded pine wants an ordinary wood primer and undercoat, with knotting solution first over any live knots so resin does not bleed through.

Plenty of a VELUX unit is off limits, and painting the wrong part causes more trouble than a tired frame ever did. Keep the brush away from all of these.

The exterior cladding is aluminium with a factory-baked coating, and it is out in the weather. Household paint will not survive there and will flake within a season, so leave the outside as it is. The rubber gaskets and the perimeter seal matter even more. Paint stiffens rubber, and a stiff seal no longer presses tight when the sash closes, which lets in draughts and lets condensation form where warm room air meets cold glazing. The ventilation flap and air filter along the top of the frame have to move and breathe, so painting them jams the airflow the window depends on. And the type plate should be masked, not covered, because once that code is gone you are guessing at sizes for any future blind or glazing unit.

Reach for a water-based acrylic satinwood or eggshell rather than an oil-based gloss. Water-based paint stays flexible, does not yellow, and holds up to the damp better, which matters here because overhead glazing collects far more condensation than a vertical window. Cold, clear nights and a warm room below, especially over a kitchen or a bathroom, put a film of moisture on that frame most mornings, and a brittle finish will lift at the edges where the water sits.

Two thin coats beat one thick one. A satin or eggshell sheen is also kinder than full gloss, because a rooflight sits in raking daylight that throws every brush mark and run into sharp relief. Give each coat proper time to cure before you shut the sash hard against the seals, or the fresh paint will stick to the rubber and pull away when you next open the window.

Think about colour, too. A dark frame in a bright, south-facing room shows every smear and fingerprint, and it soaks up warmth that a white frame would bounce back. In a room that already runs hot in summer, keeping the frame pale is the sensible choice.

A coat of paint tidies up a sound window. It does nothing for a failing one, so be honest about why the frame looks tired before you spend a weekend on it. If there is misting between the two panes of glass, the sealed unit has gone and no amount of frame paint will clear it. If the timber under a pine frame feels soft, or the seals have perished and gone hard, you are looking at a unit near the end of its life, and painting the shell of it is effort spent in the wrong place. Swapping a worn-out window for a new one is a replacement, and that is proper work with a lasting result, unlike a cosmetic tidy-up over a problem that stays put.

There is a bigger version of this worth naming. A lot of people decide to repaint a VELUX frame because the room feels dated and uncomfortable, when the real complaint is that a south-facing rear extension bakes every summer afternoon. The frame colour has nothing to do with that. The heat comes through the glass, and the number that governs it is the G-value of the glazing, not the shade of the surround. Repainting changes the look and leaves the July temperature exactly where it was. If the unit is coming out anyway, that is the moment to think about the glass rather than the frame, and our VELUX window installation work starts from orientation and glazing specification rather than the opening on its own. Where overheating is the actual issue, our solar-control glazing does the job that no paint can.

If your VELUX is in good order and you simply want it to match a redecorated room, go ahead: identify the finish, clean and key it, prime for the material, and lay on two thin coats of a pale water-based satinwood, keeping well clear of the seals, the vent flap and the exterior. Note the model code from the type plate before you start, and keep it somewhere safe.

If the glass is misted, the seals are gone, or the room overheats no matter what colour the frame is, painting is the wrong job to be doing. Tell us the model code, the orientation of the roof and the rough size, and we will come back with a sensible glazing specification and a price. Ring 01702 898232 or request a quote, and we will look at the whole window rather than just its surface.