RAL versus Dulux colours explained clearly

A white door frame, a kitchen cupboard and a window trim can all look similar at first glance - until the touch-up paint dries. That is where RAL versus Dulux colours becomes more than a question of names on a chart. They are different colour reference systems, used for different types of project, and treating one as a direct match for the other is a common cause of expensive near-misses.

If you are ordering aerosol paint for a repair, refinish or full transformation, start with the colour reference you actually have. Then make sure the paint is formulated for the surface and the finish you need.

RAL versus Dulux colours: the core difference

RAL is a standardised colour system. Most people in the UK will recognise RAL Classic references, such as RAL 7016 Anthracite Grey or RAL 9016 Traffic White. Each reference uses a number, giving manufacturers, fabricators, installers and customers a shared specification. It is particularly common on metalwork, gates, roller shutters, commercial doors, radiators, machinery, window components and powder-coated products.

Dulux colours are generally specified by colour name or code from a branded decorative colour range. They are widely used for interior and exterior decorating, including walls, woodwork, furniture and household finishes. The selection is designed around practical decorating schemes, with subtle variations in undertone and depth that help customers build a room palette.

Neither system is inherently better. RAL is often the clearer route when you need to identify an established industrial or architectural finish. Dulux can be the right reference when you are matching an existing decorative shade from a colour card, tin or previous specification. The key is to avoid assuming that similar-sounding greys, whites, greens or blues are the same colour.

Why a RAL number cannot simply be converted

There is no universal one-to-one conversion table between RAL and Dulux shades. A chart may suggest a close alternative, but close is not the same as exact. Two colours can appear identical under one light and noticeably different in another, especially with greys, creams and off-whites.

A RAL reference is a defined standard, while decorative ranges are built as individual collections. One RAL grey may sit near several Dulux greys, each with a different blue, green, brown or violet undertone. That difference can be very visible when new paint is applied alongside an existing frame, skirting board or panel.

Finish also changes the result. The same mixed colour in matt, satin, gloss or a textured coating will reflect light differently. A powder-coated aluminium door in a low-sheen finish may therefore look unlike a glossy aerosol touch-up, even where the underlying colour reference is correct.

For repair work, the original item remains the best guide. If a gate, window, radiator or piece of machinery has a clear RAL label, use that code. If the surface was painted from a decorative colour range, use the exact named shade or code where possible. When neither is known, a physical sample or professional colour match gives a stronger starting point than an online image.

When RAL is usually the right choice

Choose a RAL reference when the colour is tied to a product specification rather than a decorating scheme. This is common with powder-coated surfaces and fabricated items, where a RAL code may appear on paperwork, labels, invoices or the original order confirmation.

RAL is particularly useful for matching metal railings, garage doors, radiators, steel doors, commercial equipment, agricultural machinery and some UPVC or aluminium installations. It gives you a concise reference that can be repeated across future repairs, which matters for trade maintenance and multi-stage projects.

That said, a RAL code only confirms the colour target. It does not identify the correct coating. An aerosol intended for a radiator must tolerate regular heat cycles. Paint for a composite door or UPVC surface needs suitable adhesion and flexibility. A colour match can still fail if the product underneath it is wrong for the substrate.

When a Dulux reference makes more sense

Use a Dulux colour reference when you are continuing an existing decorative scheme or matching paint already used in the property. This is often the practical choice for furniture, internal doors, kitchen units, trims and selected exterior details where the aim is to carry a familiar wall or woodwork shade onto another surface.

It can also be useful where a homeowner has selected a colour for a room and wants smaller items to work with it - perhaps cupboard handles, a radiator cover, a metal lamp base or a decorative panel. In these cases, colour continuity matters more than compliance with an architectural RAL specification.

Be precise when placing an order. Provide the full shade name or code, rather than a broad description such as ‘sage green’ or ‘warm white’. Decorative colour names can be memorable, but they are not reliable enough on their own when there are several shades with a similar appearance.

Screens, paint charts and lighting can all mislead

A colour viewed on a phone or laptop is useful for inspiration, not for final matching. Screen settings, image editing and ambient light all affect what you see. The same issue applies to photographs of an existing item, particularly when the surface is glossy, weathered or partly shaded.

Physical colour cards are more dependable, but they still need to be viewed in the right setting. Check samples in daylight and under the artificial lighting used in the room or site. Hold the reference next to the item rather than relying on memory. Pale shades and dark neutrals are especially prone to looking different once painted over a larger area.

Ageing adds another variable. UV exposure, cleaning products, smoke, heat and general wear can alter the appearance of the original finish. A freshly mixed paint matched to the stated reference may look cleaner or deeper than a ten-year-old surface. For a small repair, that may be noticeable. For a full respray, it is usually far less of a concern.

Get the colour reference and paint system right

Before ordering, establish three things: the colour reference, the material being painted and the finish you want. These decisions work together. A perfectly mixed RAL or Dulux shade needs the right primer, preparation and topcoat system to deliver a durable finish.

Clean the surface thoroughly, remove loose or failing paint, and key sound coatings where appropriate. Bare metal, plastic, previously painted timber and UPVC each need different preparation. Mask surrounding areas carefully and test spray on a concealed section or sample piece before committing to the visible surface.

For aerosols, apply several light, even coats rather than trying to cover in one heavy pass. Keep a consistent distance and overlap each stroke. Heavy application can lead to runs, uneven sheen and slower drying, which makes colour variation more obvious. Always allow adequate flash-off and drying time between coats.

At Aerosols "R" Us, colours can be professionally blended across RAL, Dulux and other recognised systems, with aerosol formulas selected around the job in hand. That means you do not have to choose between colour accuracy and a coating suited to the surface - whether you are refreshing a radiator, restoring a vehicle part or bringing tired kitchen furniture back into line with the rest of the room.

A practical way to choose between them

If you have a RAL code on the item’s documentation, use it. If you have an exact Dulux shade from the existing decoration, use that instead. If you only have a photo, a vague description or a colour that has faded over time, treat any proposed match as an approximation and test it first.

Do not choose a RAL shade merely because it looks close to a decorative colour online, and do not select a decorative shade to match a factory-finished item without checking the original specification. The right reference saves time, reduces waste and gives your repair a far more convincing result.

A good paint job starts before the can is shaken: identify the colour properly, choose a coating made for the material, and test where a close match will not be good enough.