{"product_id":"liquid-rubber-roof-coating-cold-applied-waterproofing-system","title":"Brush-On Liquid Rubber Roof Coating – Cold-Applied Waterproofing System, 3.78L \u0026amp; 18.9L","description":"\u003cp\u003eOld felt starting to blister, a GRP roof weeping at the joints, or a run of flashing that's given up before the rest of the roof has?\u003c\/p\u003e\n\u003cp\u003eA brush-applied liquid rubber coating is often the fastest way back to watertight, without stripping the existing roof covering back to deck.\u003c\/p\u003e\n\u003cp\u003eThis is a water-based, cold-applied liquid rubber membrane that goes on by brush, roller or airless sprayer straight over sound felt, asphalt, GRP, concrete, masonry, metal and timber, curing to a flexible, seamless, fully bonded rubber skin with no seams or laps for water to find.\u003c\/p\u003e\n\n\u003ch2\u003eKey benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCold-applied — no blowtorches, hot bitumen or specialist welding equipment needed\u003c\/li\u003e\n\u003cli\u003eForms a seamless, fully bonded elastomeric membrane with no joints or seams\u003c\/li\u003e\n\u003cli\u003eWater-based formula: low odour, solvent-free, safe for use in occupied buildings\u003c\/li\u003e\n\u003cli\u003eStays flexible through UK freeze-thaw cycles rather than cracking like old bituminous paint\u003c\/li\u003e\n\u003cli\u003eBrush, roller or spray-applied — suited to detail work and larger open areas alike\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSuitable applications\u003c\/h3\u003e\n\u003cp\u003eRefurbishing worn felt, asphalt and GRP flat roofs; sealing failing box gutters, parapet details and chimney flashings; treating balconies, decks and planter boxes; general above-ground waterproofing on concrete, masonry, timber and metal.\u003c\/p\u003e\n\u003cp\u003eOn EPDM rubber roofs it's most useful as a detail-repair coating around upstands, pipe penetrations and old patch repairs rather than as a substitute for a proper EPDM membrane on the main roof field — for new EPDM installations, see our \u003ca href=\"https:\/\/rubberroofuk.uk\/collections\/epdm-membranes\"\u003eEPDM membrane range\u003c\/a\u003e instead.\u003c\/p\u003e\n\u003cp\u003eThis is the black waterproofing coating — the product for sealing and re-waterproofing.\u003c\/p\u003e\n\u003cp\u003eIf your roof is already watertight and the problem is summer heat and UV ageing, our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/solar-reflective-roof-coating-white-fibre-reinforced\"\u003ewhite Solar Reflective Roof Coating\u003c\/a\u003e is the reflective topcoat for that job, and the two are often used together: waterproof first with this, then reflect the heat with the white topcoat.\u003c\/p\u003e\n\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eColour\u003c\/th\u003e\n\u003cth\u003eCoverage (2-coat system)\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eCure\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e3.78 litres\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003ctd\u003e~1.9–2.5m² per coat\u003c\/td\u003e\n\u003ctd\u003eBrush, roller or spray\u003c\/td\u003e\n\u003ctd\u003eTouch dry within hours, full cure over several days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e18.9 litres\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003ctd\u003e~9.3–12.5m² per coat\u003c\/td\u003e\n\u003ctd\u003eBrush, roller or spray\u003c\/td\u003e\n\u003ctd\u003eTouch dry within hours, full cure over several days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size:0.9em;color:#555;\"\u003eCoverage is a guide for a standard two-coat application and will vary with substrate porosity and application method — always apply a small test area first on porous or previously coated substrates.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation \u0026amp; ordering guidance\u003c\/h3\u003e\n\u003cp\u003eSurfaces must be clean, dry and free of loose material before coating — our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/epdm-weathered-membrane-cleaner-1l-rubber-roof-uk\"\u003eEPDM Weathered Membrane Cleaner\u003c\/a\u003e is a good option for degreasing and preparing old membrane or flashing details before recoating.\u003c\/p\u003e\n\u003cp\u003eFor detail work around upstands and penetrations where a belt-and-braces seal is wanted, our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/epdm-lap-sealant-rubber-roof-uk\"\u003eEPDM Lap Sealant\u003c\/a\u003e and \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/epdm-rubber-roof-primer-high-strength-bonding-primer-for-flashings-detail-work\"\u003eEPDM Rubber Roof Primer\u003c\/a\u003e pair well as a finishing detail.\u003c\/p\u003e\n\u003cp\u003eOrder the 3.78L size for small repairs, balconies and detail work, and the 18.9L size for full roof refurbishment — as a guide, one 18.9L tub covers a two-coat system across a roughly 9–12m² roof, so measure your roof area and add a margin for detail work and a second coat before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan I apply this directly over old roofing felt or asphalt?\u003c\/strong\u003e\u003cbr\u003eYes, provided the surface is sound, clean and free of standing water or loose material — this is one of its main uses, refurbishing tired felt and asphalt roofs without a full strip-back.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many coats do I need?\u003c\/strong\u003e\u003cbr\u003eA minimum two-coat system is recommended for a fully waterproof result; the coverage figures above assume two coats.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it compatible with EPDM rubber roofing?\u003c\/strong\u003e\u003cbr\u003eIt bonds well to EPDM for detail and repair work (patches, upstand dressing, old repair touch-ups), but it isn't a substitute for a bonded EPDM membrane across a full roof field — use it as a repair\/refurbishment coating rather than a primary EPDM system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich size do I need for my roof?\u003c\/strong\u003e\u003cbr\u003eMeasure the area to be coated in m², then choose the tub that comfortably covers a two-coat application with some margin — see the coverage table above.\u003c\/p\u003e\n\u003cp\u003eFor larger commercial areas, order multiple 18.9L tubs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is it delivered and how long does it take?\u003c\/strong\u003e\u003cbr\u003eBoth sizes are dispatched from UK stock on a standard tail-lift\/parcel delivery service; typical UK mainland delivery is 2–5 working days from order.\u003c\/p\u003e\n","brand":"Rubber Roof UK","offers":[{"title":"3.78 Litres","offer_id":45995508531391,"sku":"RRUK-LRC-3.78L","price":96.99,"currency_code":"GBP","in_stock":true},{"title":"18.9 Litres","offer_id":45995508564159,"sku":"RRUK-LRC-18.9L","price":339.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/nVhTBKUvJbYBtSnid0HaGiYqfPadVxkK4J_M0Bvn63ZaQOTcCOWnCwhxzJScPBjY-V-i0zmRKX5QQqB4f9m2TI63R2c5Dv_zctIANsw3kdvBMmXn8n1f2bVGnXN28Gph6z0sk49cNd-E5BAQw_HIUZtVbeUUsxAACggiA6_FV9o.jpg?v=1786382382","url":"https:\/\/rubberroofuk.uk\/products\/liquid-rubber-roof-coating-cold-applied-waterproofing-system","provider":"Rubber Roof UK","version":"1.0","type":"link"}