{"title":"Reactive Primer","description":"\u003cp\u003eCoatings used on industrial floors are not paints — they are significantly more complex systems chemically and mechanically. The priming is also different: it is not about controlling absorbency or improving adhesion in the usual sense, but about creating a chemical bond between the concrete and the coating. A reactive — typically two-component epoxy — primer is suitable for this task.\u003c\/p\u003e\n\u003ch3\u003eWhat is the role of the reactive primer?\u003c\/h3\u003e\n\u003cp\u003eThe reactive primer penetrates the concrete structure and bonds through a chemical reaction — not by physical surface adhesion like dispersion primers. This results in a much stronger, more durable bond that does not peel off under mechanical stress, chemicals, or moisture. For industrial coating systems — epoxy floors, polyurethane waterproofing, chemically exposed surfaces — this type of primer is the only suitable solution.\u003c\/p\u003e\n\u003ch3\u003eWhere is reactive primer necessary?\u003c\/h3\u003e\n\u003cp\u003eReactive primer is used:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ebefore industrial epoxy floor coatings in warehouses, factories, workshops, and commercial spaces;\u003c\/li\u003e\n\u003cli\u003eunder polyurethane coating systems where a water- and chemical-resistant bond is required;\u003c\/li\u003e\n\u003cli\u003ein antistatic floor systems where electrical continuity must be maintained throughout the entire coating layer;\u003c\/li\u003e\n\u003cli\u003ein underground garages and roof terraces before polyurethane waterproofing;\u003c\/li\u003e\n\u003cli\u003eon food industry and laboratory surfaces where chemical cleaners are regularly applied.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat should you pay attention to during application?\u003c\/h3\u003e\n\u003cp\u003eApplying reactive primer is a professional task. For two-component systems, precise mixing ratios and processing times must be strictly followed — any deviation results in an incomplete chemical bond, and the coating’s durability cannot be guaranteed. Surface preparation of the concrete — grinding, diamond polishing, or shot blasting — is essential for the primer’s adhesion: the primer cannot properly penetrate a closed concrete surface.\u003c\/p\u003e\n\u003cp\u003eThe moisture content of the concrete substrate is critical: epoxy primer forms wet bubbles on concrete with high moisture content. Moisture measurement must be performed before priming.\u003c\/p\u003e\n\u003ch3\u003eHow does reactive primer differ from deep primer?\u003c\/h3\u003e\n\u003cp\u003eDeep primer is dispersion-based and balances absorbency on highly porous substrates — it does not create a chemical bond. Reactive epoxy primer bonds physically and chemically and is only suitable under reactive coating systems (epoxy, PU). The functions and application areas of the two materials are not interchangeable.\u003c\/p\u003e\n\u003cp\u003eBrowse our reactive primers or request advice to select the right coating and primer combination for your industrial floor system.\u003c\/p\u003e","products":[{"product_id":"kerakoll-ep21","title":"Kerakoll EP21 vapor barrier hardening epoxy primer","description":"\u003cp\u003eKerakoll EP21 is a transparent, two-component reactive primer for absorbent floor substrates. It penetrates, hardens, and becomes waterproof — protects up to 5% CM moisture content. Suitable under parquet, for Cementoresina systems, and for strengthening weak substrates. This is the primer for Kerakoll’s floor and resin systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStrengthens and waterproofs simultaneously: reinforces weak substrates, protects against residual moisture up to 5% CM\u003c\/li\u003e\n\u003cli\u003ePart of the system: primer for parquet flooring and \u003ca href=\"\/en\/products\/kerakoll-cementoresina-color-collection\"\u003eCementoresina\u003c\/a\u003e floor systems\u003c\/li\u003e\n\u003cli\u003eFor absorbent substrates: cement screed, anhydrite screed, mineral-based floors\u003c\/li\u003e\n\u003cli\u003eCompatible with underfloor heating: suitable for reinforcing heated substrates\u003c\/li\u003e\n\u003cli\u003eEC 1 Plus certification: low VOC emissions, A+ indoor air quality rating\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en\/products\/kerakoll-keragrip-eco-pulep\"\u003eKeragrip Eco Pulep\u003c\/a\u003e thinner must be used: diluted 15–30% depending on substrate absorbency\u003c\/li\u003e\n\u003cli\u003eMust be finished with a topcoat or adhesive: not a finished surface on its own\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePackaging\u003c\/th\u003e\n\u003ctd\u003e2.5 kg can + 1 kg bottle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial consumption\u003c\/th\u003e\n\u003ctd\u003eas surface primer ≈ 0.2 kg\/m\u003csup\u003e2\u003c\/sup\u003e\u003cbr\u003eas deep primer\/waterproofing ≈ 0.3 – 0.4 kg\/m\u003csup\u003e2\u003c\/sup\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWaiting time between layers\u003c\/th\u003e\n\u003ctd\u003e4–12 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWaiting time before next work phase\u003c\/th\u003e\n\u003ctd\u003e24 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003e≈ 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eWhat is it suitable for?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eSubstrates:\u003c\/strong\u003e Cement screed, anhydrite screed, mineral screeds, underfloor heated substrates — with \u003ca href=\"\/en\/products\/kerakoll-keragrip-eco-pulep\"\u003eKeragrip Eco Pulep\u003c\/a\u003e thinner (max 30%)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpaces (floor only):\u003c\/strong\u003e Residential areas, offices, shops, restaurants. Wet areas (bathroom, kitchen) under parquet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e Non-absorbent substrates (marble, ceramic, glass mosaic). Surfaces exposed to soaking. Waterproofing of underfloor heated cement screed above 2% CM, anhydrite above 0.5% CM (above 0.2% for underfloor heating). As a standalone surface.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is EP21 for?\u003c\/strong\u003e \u003cbr\u003ePrimer and waterproofing in one. Strengthens weak substrates, protects against moisture under parquet. First layer for Cementoresina and resin floor systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs a primer needed under parquet?\u003c\/strong\u003e \u003cbr\u003eYes, on absorbent substrates. EP21 strengthens the substrate and protects the parquet from residual moisture — up to 5% CM.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan parquet be installed on a damp substrate?\u003c\/strong\u003e \u003cbr\u003eYes, up to 5% CM moisture content if EP21 waterproofing is used (2 layers). Stricter limits for underfloor heating: cement max 2% CM, anhydrite max 0.5% CM.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOn what substrates can it be applied?\u003c\/strong\u003e \u003cbr\u003eOnly on absorbent substrates: cement screed, anhydrite screed, mineral bases. Not on ceramic, marble, glass mosaic — for those use \u003ca href=\"\/en\/products\/kerakoll-keragrip-eco-pulep\"\u003eKeragrip Eco Pulep\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it need to be diluted?\u003c\/strong\u003e \u003cbr\u003eYes. With \u003ca href=\"\/en\/products\/kerakoll-keragrip-eco-pulep\"\u003eKeragrip Eco Pulep\u003c\/a\u003e according to substrate absorbency: up to 15% for surface priming, up to 30% for deep priming or waterproofing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to mix?\u003c\/strong\u003e \u003cbr\u003eIn a 2.5:1 ratio (Part A : Part B). Mix evenly with an electric mixer (300–600 rpm).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long before the next layer?\u003c\/strong\u003e \u003cbr\u003e4 hours. Wait 4–12 hours between layers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for underfloor heating?\u003c\/strong\u003e \u003cbr\u003eYes, suitable for reinforcement and priming. Not for waterproofing — moisture limits are stricter for underfloor heated screeds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEP21 or Keragrip Eco Pulep?\u003c\/strong\u003e \u003cbr\u003eEP21 is for absorbent substrates — it strengthens and waterproofs. \u003ca href=\"\/en\/products\/kerakoll-keragrip-eco-pulep\"\u003eKeragrip Eco Pulep\u003c\/a\u003e provides adhesion on non-absorbent surfaces (ceramic, glass mosaic). They serve different purposes.\u003c\/p\u003e","brand":"Kerakoll","offers":[{"title":"2.5 kg + 1 kg \/ Normal","offer_id":43325706797314,"sku":"15007","price":48950.0,"currency_code":"HUF","in_stock":true},{"title":"2.5 kg + 1 kg \/ Expired (-50%)","offer_id":54903243604292,"sku":"15007-exp","price":24475.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-ep21-alapozok-szilarditok-es-vizszigetelo-termekek-37231461826818.jpg?v=1702744578"},{"product_id":"kerakoll-factory-primermaxi-ep","title":"Kerakoll Factory Primermaxi EP epoxy floor primer","description":"\u003cp\u003e Epoxy system for the preparation of substrates before the construction of synthetic resin continuous floors. Ideal for GreenBuilding. Solvent-free, protects users' health.\u003c\/p\u003e\n\n\u003cp\u003e Kerakoll Primermaxi EP is ideal both for preparing the substrate layers before applying a film-like top layer and for smoothing the substrate before the implementation of multi-layer or self-leveling systems.\u003c\/p\u003e\n\n\u003ctable\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e Wrapping\u003c\/th\u003e\n\n\u003ctd\u003e Part A bucket 10 kg - Part B: 3 kg can\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e Material requirement\u003c\/th\u003e\n\n\u003ctd\u003e application by roller ≈ 200 – 300 g\/m \u003csup\u003e2\u003c\/sup\u003e per application layer\u003cbr\u003e application with a smoothing iron ≈ 500 ‑ 700 g\/m \u003csup\u003e2\u003c\/sup\u003e per application layer\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e Storage\u003c\/th\u003e\n\n\u003ctd\u003e ≈ 24 months\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e","brand":"Kerakoll","offers":[{"title":"Default Title","offer_id":42900801028354,"sku":"14400, 14445","price":144950.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-factory-primermaxi-ep-ipari-mugyantapadlok-37455548383490.jpg?v=1702749966"},{"product_id":"ardex-pu-30","title":"ARDEX PU 30","description":"\u003cp\u003eARDEX PU 30 is a single-component, solvent-free polyurethane primer designed for moisture sealing, surface hardening, and adhesion improvement. It is excellently suited for cement and concrete surfaces, as well as for pretreating various substrates before applying reactive adhesives and floor coatings. It dries quickly, penetrates deeply, and provides a durable, strong base for subsequent work processes. \u003cbr\u003e\u003cbr\u003eARDEX PU 30 effectively seals residual moisture in the substrate, prevents moisture-related damage, and improves the adhesion of coverings even on critical substrates. Suitable for both indoor and outdoor use, it is resistant to chemicals and weather conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFast drying, efficient work\u003c\/strong\u003e\u003cbr\u003eProcessable after 1 hour, reduces construction time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePenetrates deeply, strengthens the substrate\u003cbr\u003e\u003c\/strong\u003eThanks to its low viscosity, it reinforces porous and weak surfaces.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile and easy to apply\u003cbr\u003e\u003c\/strong\u003eCan be easily processed by hand, roller, or brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVery low emission, safe\u003cbr\u003e\u003c\/strong\u003eEnvironmentally friendly, solvent-free formula with minimal harmful emissions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWater- and solvent-free, durable solution\u003cbr\u003e\u003c\/strong\u003ePrevents damage caused by moisture, increasing the substrate's lifespan.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eWrapping\u003c\/th\u003e\n\u003ctd\u003eOf course, 11 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial requirements\u003c\/th\u003e\n\u003ctd\u003eCondition:\u003cbr\u003eas a primer for a single application\u003cbr\u003eas a moisture barrier layer in case of double application\u003cbr\u003e\u003cbr\u003eYield:\u003cbr\u003e100 - 150 g\/m2\u003cbr\u003e250 - 300 g\/m2\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003e≈ 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"ARDEX","offers":[{"title":"11 kg","offer_id":53888663912772,"sku":"4888","price":219150.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/ardex-pu-30-gyors-szaradas-alapozo.png?v=1734115315"}],"url":"https:\/\/www.masterworks.hu\/en\/collections\/alapozok-reaktiv-alapozo.oembed","provider":"Masterworks Hungary","version":"1.0","type":"link"}