Quick answer
Some fading is normal on any coloured GRP door, but the rate varies hugely by pigment and orientation. Reds and dark blues fade fastest under Cornwall's high UV; blacks, greys and whites fade least. Genuine Endurance-colour skins carry a 10-year colour-fastness guarantee, so check your paperwork before assuming yours is beyond help.
Overview
GRP skins are UV-stable but some colours fade - reds and dark blues most, blacks and whites least. Coastal Cornwall's UV levels are higher than average.
Symptoms
- Colour dulled compared to sheltered edges.
- Uneven fade in south-facing installs.
Common causes
- UV exposure.
- Salt air acceleration.
- Poorer-grade pigments in cheap doors.
Why Cornish sun fades composite doors faster than inland ones
Coastal Cornwall sees noticeably higher UV loading than most of the UK, partly because there's less atmospheric haze off the Atlantic and partly because reflected light off the sea and pale render bounces extra UV onto a south-facing door face. A door in St Ives or Falmouth is working harder than the same door in Bodmin.
Pigments absorb UV energy and, over years, that energy breaks down the molecular bonds that give a colour its depth. Reds and dark blues use organic pigments that are inherently less UV-stable than the inorganic oxides used in blacks, greys and anthracite. That's not a manufacturing fault, it's basic pigment chemistry, and it's true of car paint, garden furniture and composite doors alike.
Salt-laden sea mist adds a second mechanism: fine salt crystals sit on the surface and act almost like a very mild abrasive under UV, accelerating the dulling of the gel-coat's surface sheen even before the underlying colour itself has shifted.
How to tell genuine fading from surface dirt or chalking
Before assuming your door has faded, rule out the simpler explanations. Run a soft cloth with warm soapy water over a small panel and see if the dullness lifts. Salt film and traffic grime both look like fading from a few feet away but wipe off in minutes.
A genuine fade check is the sheltered-edge test. Composite doors typically have a lip under the letterbox flap, behind the handle backplate, or along the hinge edge that's never been exposed to direct sun. Compare the colour there against the main face in good daylight, not under a porch light. A visible difference confirms true pigment fade rather than surface soiling.
- Compare the door face to the hinge-side edge, not to a photo from years ago.
- Check colour under the letterbox flap or handle backplate.
- Test in daylight, not artificial light, which flatters faded colours.
What a 10-year colour-fastness guarantee actually covers
Endurance colours are bonded through the GRP skin rather than applied as a surface film, and that construction is what underpins the 10-year colour-fastness guarantee. In practice that means the pigment runs through the thickness of the moulded skin, so light surface wear doesn't expose a different colour underneath, and the manufacturer stands behind a defined level of retained colour over a decade.
If your door was supplied and fitted by us, check your installation paperwork for the colour reference and guarantee start date. A guarantee claim typically needs photographic comparison against the original colour swatch or a sheltered area of the door, so keep those early photos if you have them.
If the door predates us or came from another installer, we can still assess it and tell you honestly whether what you're seeing is normal ageing or something a claim might cover, without any obligation to buy a replacement.
Cleaning and waxing to slow further fading
You cannot reverse fading that has already happened with cleaning alone, but you can slow further loss of colour depth and put a shine back on a dulled surface. A quarterly wash with warm water and a mild detergent removes the salt film that accelerates UV damage.
An annual coat of automotive-grade carnauba wax adds a sacrificial UV-blocking layer over the gel-coat, similar to waxing a car. It won't restore lost pigment but it noticeably improves the visual depth of colour on a dulled door and buys time before you need to think about replacement.
When fading means it's time to consider a new door
If the whole door has faded evenly, the finish looks chalky rather than glossy even after cleaning, and the door is 12-15 years old or more, you're generally past the point where cleaning and waxing make a meaningful visual difference. At that stage the GRP skin itself has weathered, not just the surface film.
That's usually also the point at which other wear starts stacking up: hardware that's had its day, seals losing compression, and a colour that no longer matches current ranges if you ever wanted a like-for-like touch-up. Replacing rather than restoring often ends up the more sensible spend once you add it all up.
Choosing a fade-resistant colour if you're replacing
If fading has been the recurring issue, it's worth factoring that into your next colour choice. Blacks, anthracite greys and whites consistently show the least visible fade over a decade because their pigments are more UV-stable by nature, not because of any special coating.
Reds, bright blues and greens will always fade faster in a south-facing, sun-exposed position, whatever brand supplies them. That doesn't mean avoid them entirely, particularly on a sheltered or north-facing door, but going in with realistic expectations avoids disappointment five years down the line.
Fading on holiday lets and rental properties
Holiday let doors in exposed coastal spots often show fading sooner than owner-occupied homes simply because nobody's cleaning them between guest changeovers on the same schedule as a family home would. If you manage a let, building a quick wipe-down into the changeover checklist costs nothing and meaningfully extends how long the colour holds up.
It's also worth photographing the door at handover to a new letting agent or cleaning contractor so there's a clear baseline if you ever want to make a warranty comparison later.
What the colour-fastness guarantee does and does not cover
The 10-year colour-fastness guarantee on Endurance colours covers pigment loss beyond a defined tolerance measured against the original colour swatch, on a door supplied and fitted correctly. It does not cover fading caused by overpainting, contact with harsh chemical cleaners, or damage from sitting permanently under a leaking gutter that keeps one panel wetter than the rest of the door.
It also will not cover a door that has been relocated from its original opening, since orientation and exposure are part of what the guarantee assessment weighs up. If you move house and take a door with you, the guarantee terms travel with the original installation record, not with wherever the door ends up next.
A claim is assessed against a sheltered reference area on the same door, not against a printed brochure swatch, because even genuine paper swatches shift slightly in print runs over a decade. Keep any early photographs and your installation paperwork together somewhere you can find them.
A seasonal care calendar for keeping colour depth longer
Spring is the best time for the first proper wash of the year, clearing winter salt and grime before the stronger summer sun starts working on the pigment. A warm soapy wipe-down, rinsed and dried, resets the surface before UV loading picks up through late spring and summer.
Midsummer is when a carnauba wax pass earns its keep most, adding a sacrificial UV-reflective layer during the months of highest sun intensity along the Cornish coast. Fitting it in around a bank holiday or the start of the school holidays is an easy way to remember.
Autumn and winter need less intervention beyond an occasional rinse to remove storm-driven salt spray, but it is worth checking the sheltered hinge edge against the main face once a year, ideally at the same time each autumn, so any genuine fade trend is caught early rather than assumed.
- Spring: full wash to clear winter salt before summer UV peaks.
- Summer: annual carnauba wax pass for UV protection.
- Autumn: sheltered-edge colour check and a final rinse before winter storms.
North-facing versus south-facing doors and how fast they fade
A south-facing door in an exposed Cornish position can see two or three times the direct UV exposure of an equivalent north-facing door over a year, and the difference shows clearly by year five or six. South-facing doors in reds and blues are the combination we see needing attention soonest.
North-facing doors fade more slowly but are not free from problems, since they tend to stay damper for longer after rain and are more prone to algae and lichen growth, particularly under trees or where a wall shades the porch. The issue there is less about pigment loss and more about a green or black film building up on top of the colour.
If you are choosing a colour for a south-facing opening, lean towards the more UV-stable shades. For a shaded north-facing door, the priority shifts to a cleaning routine that stops organic growth taking hold rather than worrying about sun-driven fade.
Products to avoid when treating a faded door
Avoid anything described as a cutting compound, rubbing compound or bodywork polish for cars, since these are formulated for much tougher automotive clear coats and will dull the finer satin finish typical of a composite door skin. Bleach-based bathroom or kitchen sprays should also stay away from the door, as repeated contact can leave a visible patch that looks worse than the fade you started with.
Pressure washers held too close are another common own-goal. The force can drive water past the seals around glazing units and letterboxes even if the surface itself looks unaffected, so always keep a wide fan setting and a sensible distance if you use one at all near a door.
How we assess a faded door on site
When we visit to look at a faded door, we start with the sheltered-edge comparison in natural daylight, checking the colour under the letterbox flap and behind the handle backplate against the main face. That single check tells us within minutes whether we are looking at genuine pigment fade or surface soiling that will wash off.
We then check the installation date and colour reference against the guarantee terms, note the door's orientation and any obvious local factors like an overhanging tree or a south wall reflecting extra sun, and give you a straight answer on whether a wash and wax will make a real difference or whether the door has weathered past that point.
Typical repair costs in Cornwall
| Work | Typical price | Notes |
|---|---|---|
| Deep clean and wax service | £45-£75 | Restores sheen, slows further fade |
| Warranty assessment visit | Free with us | For doors we supplied and fitted |
| New door in fade-resistant colour | From £1,395 fitted | 10-year colour-fastness guarantee |
Guide prices only — we confirm the cost after seeing the door.
When to call a professional
- For a warranty claim assessment.
Prevention
- Choose brands with UV-stable pigment warranties.
