{"product_id":"crown-trade-fastflow-quick-dry-primer-undercoat-white-2-5l-1","title":"Crown Trade Fastflow Quick Dry Primer Undercoat White 2.5L","description":"\u003cp\u003eCrown Trade Fastflow Quick Dry Primer Undercoat is a water-based, 99% solvent-free primer undercoat for interior and exterior joinery and prepared metalwork. Touch dry in 1–2 hours and recoatable from 4 hours, this 2.5-litre tin covers up to 37.5m² — making it the recommended basecoat for the Crown Trade Fastflow system before applying Fastflow Quick Dry Gloss, Satin, or Eggshell top coats.\u003c\/p\u003e\n\u003cp\u003ePart of Crown's Breatheasy range, this combined primer and undercoat delivers excellent coverage with low odour and smooth flow that feels like a traditional oil-based undercoat. Suitable for doors, windows, skirting boards, architraves, and prepared metal surfaces including radiators and pipework — both indoors and out.\u003c\/p\u003e\n\u003ch2\u003eKey benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCombined primer and undercoat in one product — saves time and reduces coats needed\u003c\/li\u003e\n\u003cli\u003eBreatheasy formula — 99% solvent free with low odour, suitable for occupied buildings\u003c\/li\u003e\n\u003cli\u003eTouch dry in 1–2 hours, recoatable from 4 hours — keeps projects on schedule\u003c\/li\u003e\n\u003cli\u003eCoverage up to 15m² per litre (up to 37.5m² from this 2.5L tin)\u003c\/li\u003e\n\u003cli\u003eExcellent flow — applies and feels like a traditional oil-based undercoat\u003c\/li\u003e\n\u003cli\u003eSuitable for interior and exterior use on wood, metal, and PVCu\u003c\/li\u003e\n\u003cli\u003eBREEAM and LEED accredited\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBest for\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBasecoat under Crown Trade Fastflow Quick Dry Gloss, Satin, or Eggshell\u003c\/li\u003e\n\u003cli\u003eInterior joinery — doors, skirting boards, architraves, window frames, and trim\u003c\/li\u003e\n\u003cli\u003eExterior joinery — window sills, fascias, and door frames\u003c\/li\u003e\n\u003cli\u003ePrepared metal surfaces — radiators, pipework, railings, and gates\u003c\/li\u003e\n\u003cli\u003ePVCu surfaces with suitable preparation\u003c\/li\u003e\n\u003cli\u003eOccupied properties where low odour and fast drying are essential — housing, healthcare, education, offices\u003c\/li\u003e\n\u003cli\u003eTrade decorators, maintenance teams, and contractors needing same-day recoat capability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey features – why it matters\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-function primer undercoat:\u003c\/strong\u003e Combines primer and undercoat in a single product, reducing the number of coats and steps needed before applying your chosen Fastflow top coat. Saves time on site without compromising adhesion or finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormulated for the Fastflow system:\u003c\/strong\u003e Specifically developed to work with Crown Trade Fastflow Quick Dry Gloss, Satin, and Eggshell. Using it as part of the system helps achieve a smoother, higher-sheen top coat finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreatheasy 99% solvent-free formula:\u003c\/strong\u003e Very low odour during application and drying — reduces disruption in occupied spaces and is far more pleasant to work with than solvent-based undercoats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick dry performance:\u003c\/strong\u003e Touch dry in 1–2 hours and ready for a top coat from 4 hours under good conditions. Allows priming and first top coat in the same working day.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent coverage and flow:\u003c\/strong\u003e Spreads smoothly by brush, roller, or spray with up to 15m² per litre coverage. Applies like a traditional oil undercoat with good self-levelling properties.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterior and exterior use:\u003c\/strong\u003e Suitable for both internal trim and external joinery and metalwork, giving flexibility across a wide range of trade and DIY projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBREEAM \/ LEED accredited:\u003c\/strong\u003e Meets recognised environmental standards for specification on sustainable construction and refurbishment projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eCrown Trade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct\u003c\/th\u003e\n\u003ctd\u003eFastflow Quick Dry Primer Undercoat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003ctd\u003eA01316\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEAN\u003c\/th\u003e\n\u003ctd\u003e5010131552908\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColour\u003c\/th\u003e\n\u003ctd\u003eWhite (also available in Charcoal Grey and tinted colours)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e2.5 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePaint type\u003c\/th\u003e\n\u003ctd\u003eWater-based (acrylic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eUndercoat \/ matt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFormulation\u003c\/th\u003e\n\u003ctd\u003eBreatheasy — 99% solvent free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoverage\u003c\/th\u003e\n\u003ctd\u003eUp to 15m² per litre (up to 37.5m² per tin)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTouch dry\u003c\/th\u003e\n\u003ctd\u003e1–2 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecoat time\u003c\/th\u003e\n\u003ctd\u003eFrom 4 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended coats\u003c\/th\u003e\n\u003ctd\u003e1 (additional coats may be needed over dark colours)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication method\u003c\/th\u003e\n\u003ctd\u003eBrush (synthetic), roller (microfibre medium pile), or spray\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuitable substrates\u003c\/th\u003e\n\u003ctd\u003eWood, metal, PVCu\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInterior \/ exterior\u003c\/th\u003e\n\u003ctd\u003eBoth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVOC category\u003c\/th\u003e\n\u003ctd\u003eEU Cat A\/d limit: 130 g\/l (2010)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAccreditations\u003c\/th\u003e\n\u003ctd\u003eBREEAM \/ LEED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible top coats\u003c\/th\u003e\n\u003ctd\u003eCrown Trade Fastflow Quick Dry Gloss, Satin, Eggshell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eHow to use\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eEnsure all surfaces are sound, dry, clean, and free from dirt, grease, dust, and loose or flaking paint.\u003c\/li\u003e\n\u003cli\u003eOn bare wood, treat knots with two coats of fresh knotting. Fill holes and defects with a suitable filler, sand smooth, and remove all dust. Apply one coat of Crown Trade Fastflow Quick Dry Primer Undercoat.\u003c\/li\u003e\n\u003cli\u003eOn bare or prepared metal, remove all rust and corrosion back to bright metal. Prime with a suitable metal primer (such as Crown Trade High Build Rust Inhibiting Primer or Crown Trade Water Based Metal Primer), then apply one coat of Fastflow Quick Dry Primer Undercoat.\u003c\/li\u003e\n\u003cli\u003eOn previously painted surfaces in good condition, wash with hot water and detergent, wet abrade glossy or eggshell finishes to provide a key, rinse with clean water, and allow to dry. Spot prime any bare areas with one coat of Fastflow Quick Dry Primer Undercoat.\u003c\/li\u003e\n\u003cli\u003eStir well before use. Apply with a good synthetic brush, microfibre medium pile roller, or spray system to achieve an even thickness. On timber, lay off in the direction of the grain.\u003c\/li\u003e\n\u003cli\u003eTo assist application on porous surfaces, the substrate may be dampened slightly.\u003c\/li\u003e\n\u003cli\u003eAllow to dry fully before applying your chosen Fastflow top coat. Do not apply when the temperature is below 8°C or when relative humidity is above 80%.\u003c\/li\u003e\n\u003cli\u003eClean brushes and rollers with water immediately after use.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eCare \u0026amp; safety\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTake additional precautions when preparing pre-1960s painted surfaces, which may contain lead.\u003c\/li\u003e\n\u003cli\u003eDo not apply in temperatures below 8°C or in damp conditions.\u003c\/li\u003e\n\u003cli\u003eStore in a cool, dry place. Protect from frost.\u003c\/li\u003e\n\u003cli\u003eDispose of empty tins responsibly in accordance with local regulations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTypical applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBasecoat for the Crown Trade Fastflow Quick Dry system on all interior and exterior trim\u003c\/li\u003e\n\u003cli\u003eResidential redecoration — doors, skirting, architraves, window frames, and radiators\u003c\/li\u003e\n\u003cli\u003eCommercial and contract decorating — offices, hotels, schools, hospitals, care homes\u003c\/li\u003e\n\u003cli\u003eSocial housing and local authority maintenance programmes\u003c\/li\u003e\n\u003cli\u003eExterior joinery — window sills, fascias, door frames, and gates\u003c\/li\u003e\n\u003cli\u003eNew-build and refurbishment projects requiring BREEAM or LEED compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDelivery \u0026amp; returns\u003c\/h2\u003e\n\u003cp\u003eFree UK delivery on orders over £50. 28-day returns apply.\u003c\/p\u003e\n\u003ch2\u003eWhy buy from London Decorators Merchants\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIndependent, family-owned business with 16 decorating stores nationwide\u003c\/li\u003e\n\u003cli\u003eTrade-friendly service, support, and trade accounts available\u003c\/li\u003e\n\u003cli\u003eUK stock with fast dispatch\u003c\/li\u003e\n\u003cli\u003eExpert advice on Crown Trade products and decorating systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eOrder online now or visit your nearest London Decorators Merchants branch for trade prices and expert advice.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\u003ch3\u003eIs Crown Trade Fastflow Quick Dry Primer Undercoat water-based?\u003c\/h3\u003e\n\u003cp\u003eYes. It uses Crown's Breatheasy formula, which is 99% solvent free. This means low odour, quick drying, and easy water clean-up — while still applying and feeling like a traditional oil-based undercoat.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to dry before I can apply a top coat?\u003c\/h3\u003e\n\u003cp\u003eIt is touch dry in 1–2 hours and recoatable from 4 hours under good conditions. This allows you to prime and apply a first top coat in the same working day. At lower temperatures or higher humidity, drying times will be longer.\u003c\/p\u003e\n\u003ch3\u003eHow much does the 2.5L tin cover?\u003c\/h3\u003e\n\u003cp\u003eCoverage is up to 15m² per litre, giving up to 37.5m² from this 2.5-litre tin depending on the surface texture and porosity. One coat is normally sufficient, though additional coats may be needed over very dark colours.\u003c\/p\u003e\n\u003ch3\u003eWhich top coats can I use over this primer undercoat?\u003c\/h3\u003e\n\u003cp\u003eIt is specifically formulated for use with the Crown Trade Fastflow Quick Dry range — including Fastflow Quick Dry Gloss, Fastflow Quick Dry Satin, and Fastflow Quick Dry Eggshell. Using it as part of the system helps achieve the best possible top coat finish.\u003c\/p\u003e\n\u003ch3\u003eCan I use it over existing oil-based paint?\u003c\/h3\u003e\n\u003cp\u003eYes, provided the existing paint is sound. Wash the surface with hot water and detergent, wet abrade any glossy or eggshell finishes to provide a key, rinse with clean water, and allow to dry fully before applying the primer undercoat.\u003c\/p\u003e\n\u003ch3\u003eWhat surfaces is it suitable for?\u003c\/h3\u003e\n\u003cp\u003eIt is suitable for prepared interior and exterior wood, metal (ferrous and non-ferrous with appropriate priming), and PVCu. Common uses include doors, window frames, skirting boards, architraves, radiators, pipework, and railings.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is Crown Trade Fastflow Quick Dry Primer Undercoat water-based?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. It uses Crown's Breatheasy formula, which is 99% solvent free. 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