# Does composite decking fade? Weathering and colour fastness explained Canonical: https://woodplasticcomposite.net/guides/composite-decking-fading-colour-fastness/ Language: en Updated: 2026-10-17 Version: 1 Author: J. A. Gill Author profile: https://woodplasticcomposite.net/authors/j-a-gill/ ## Summary Colour fastness means resistance to change under stated conditions, not a promise of identical colour forever. UV exposure, moisture, dirt and surface formulation all influence appearance. Assess clean, dry boards before deciding whether you are seeing weathering, staining or damage. ## Early change versus continuing deterioration Some uncapped composites develop an initial colour change as exposed wood constituents weather. Capped finishes behave differently, and stabilisers do not make any surface immune to exposure. Ask for the expected behaviour of the exact collection. Do not promise a fixed percentage of fading or a universal stabilisation period. https://woodplasticcomposite.net/guides/composite-decking-fading-colour-fastness/#section-01 ## Why two areas look different A rug, planter or canopy changes light and moisture exposure. Furniture shadows and sheltered fence faces can age differently from open areas. Wetness, lighting angle and camera settings also affect comparisons. Compare cleaned, dry surfaces under similar light before treating a visible difference as a material failure. https://woodplasticcomposite.net/guides/composite-decking-fading-colour-fastness/#section-02 ## What a colour test does and does not prove Accelerated weathering results describe specimens and defined laboratory conditions. They do not translate automatically into a precise number of outdoor years. Where a warranty uses a colour-difference threshold, read its method, exclusions and assessment process. A phone photograph cannot substitute for a specified colour measurement. https://woodplasticcomposite.net/guides/composite-decking-fading-colour-fastness/#section-03 ## Managing expectations and replacement Photograph the installation at handover and keep a labelled spare from the batch if practical. New replacements can contrast with aged boards; colour names do not guarantee an invisible repair. Do not oil, paint or seal a faded surface without written approval. Rapid patchy change with peeling or cracking deserves investigation. https://woodplasticcomposite.net/guides/composite-decking-fading-colour-fastness/#section-04 ## Product instructions come first Identify the manufacturer, collection, capped or uncapped surface and installation date before choosing a treatment. A method suitable for one composite can damage another. Start with loose-dirt removal, then a small test using the permitted cleaner and a soft non-metal brush. Rinse thoroughly and assess when completely dry. Follow the product's dilution, contact time and care instructions; never mix cleaning chemicals. Restrict access while the surface is wet or unsafe. https://woodplasticcomposite.net/guides/composite-decking-fading-colour-fastness/#product-instructions ## Green Plank product support For Green Plank decking, fencing or cladding, request the current care instructions for your exact profile and finish. The Green Plank links below are commercial documentation resources. These guides provide general care advice, not a product certification or a decision on any individual warranty claim. https://woodplasticcomposite.net/guides/composite-decking-fading-colour-fastness/#green-plank-support ## Key points Colour fastness means resistance to change under stated conditions, not a promise of identical colour forever. UV exposure, moisture, dirt and surface formulation all influence appearance. Assess clean, dry boards before deciding whether you are seeing weathering, staining or damage. ## Comparison Observation|Recommended response Difference beneath a mat|Compare exposure and moisture history Uniform gradual appearance change|Check the collection's weathering guidance Peeling, cracking or rapid local bleaching|Record evidence and request assessment ## Does UV-resistant mean no fading? No. It indicates resistance, whose level depends on the product and test conditions. ## Will a replacement match immediately? Not necessarily. Batch differences and the surrounding boards' weathering can make a new board stand out. ## Sources 1. Green Plank — Decking product information — https://greenplank.eu/products/composite-decking-and-wpc-boards-eu-made-green-plank/terratuff-capped-composite-decking-eu-made-green-plank 2. USDA Forest Products Laboratory — Considerations in the weathering of wood-plastic composites — https://research.fs.usda.gov/treesearch/27307 3. Health and Safety Executive (HSE) — Cleaning and slip prevention — https://www.hse.gov.uk/slips/cleaning.htm