{"title":"Special Primer","description":"\u003cp\u003eThere are substrates for which neither deep primer nor bonding bridge provides an adequate solution — because the substrate material has special chemical properties that require different treatment. The most common cases are calcium sulfate (anhydrite) screed, drywall, and previously painted surfaces treated with chemical cleaners.\u003c\/p\u003e\n\u003ch3\u003ePreparation of Calcium Sulfate and Anhydrite Screed\u003c\/h3\u003e\n\u003cp\u003eCalcium sulfate (anhydrite) screed — a substrate that looks similar to traditional cement screed but has completely different chemical behavior — is one of the most common sources of incorrect substrate preparation decisions. It is not directly compatible with cement-based tile adhesives and standard primers: chemical incompatibility disrupts the bonding process, leading to early failure of the adhesive. Calcium sulfate screed should only be prepared with a specially certified primer and covered with an adhesive system compatible with it.\u003c\/p\u003e\n\u003cp\u003eTo identify calcium sulfate screed on site: a water test (the surface darkens immediately and hardly absorbs water) and a scratch test (it is not scratched as easily as gypsum) help. In uncertain cases, the contractor’s documentation should be obtained.\u003c\/p\u003e\n\u003ch3\u003eDrywall Preparation\u003c\/h3\u003e\n\u003cp\u003eCeramic tiles can only be installed on drywall with proper preparation. The drywall surface is absorbent, but the paper surface and gypsum core behave differently — especially when wet — which can cause problems in the adhesive curing process. A special drywall primer balances the absorbency and strengthens the paper-adhesive bond. In wet rooms (showers, walls next to bathtubs), drywall must be water-resistant and used only together with the waterproofing system prescribed by the manufacturer.\u003c\/p\u003e\n\u003ch3\u003ePreparation of Painted and Chemically Treated Surfaces\u003c\/h3\u003e\n\u003cp\u003ePreviously painted walls, surfaces treated with industrial cleaners, and impregnated stone surfaces also require special priming. Standard primers do not penetrate the paint layer and do not bond properly to chemical residues. The special adhesion-enhancing primer physically etches and embeds into the old coating, creating a stable surface for the next layer.\u003c\/p\u003e\n\u003ch3\u003eWhen Is a Special Primer Absolutely Necessary?\u003c\/h3\u003e\n\u003cp\u003eUse of a special primer is mandatory:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eon calcium sulfate and anhydrite screed before tile adhesive, leveling compound, and screed;\u003c\/li\u003e\n\u003cli\u003eon drywall in wet rooms before waterproofing;\u003c\/li\u003e\n\u003cli\u003eon painted, impregnated, or chemically treated substrates before tiling and plastering;\u003c\/li\u003e\n\u003cli\u003ewhere the substrate type cannot be reliably identified and cement compatibility is uncertain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIncorrect substrate preparation decisions on calcium sulfate screed not only lead to tile failure — the entire system must be removed. This results in significantly higher repair costs than proper preparation done on time.\u003c\/p\u003e\n\u003cp\u003eBrowse our special primers or request advice to assemble the right preparation for your substrate type and planned system.\u003c\/p\u003e","products":[{"product_id":"kerakoll-biocalce-silicato-fondo","title":"Kerakoll Biocalce Silicato Fondo crack-bridging filling primer","description":"\u003cp\u003eCertified, eco-compatible pure stabilized potassium silicate based natural intermediate filler primer, ideal for GreenBuilding and for the restoration of monuments.\u003c\/p\u003e\n\n\u003cp\u003e Contains only natural ingredients. It has natural ventilation, actively dilutes concentrated indoor pollutants, has a natural anti-bacterial and anti-fungal effect, is environmentally friendly and protects the health of users.\u003c\/p\u003e\n\n\u003cp\u003e Biocalce® Silicato Fondo for uniform absorption of uneven substrates and restoration of uniformity before silicate decoration cycles. In accordance with DIN 18363, it is naturally protected with pine oil.\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 Bucket 14 ℓ \/ 4 ℓ\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 ≈ 0.15 – 0.25 ℓ\/m \u003csup\u003e2\u003c\/sup\u003e for one 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 ≈ 6 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":"4 L (20 m²)","offer_id":43325757587714,"sku":"05055","price":29300.0,"currency_code":"HUF","in_stock":true},{"title":"14 L (70 m²)","offer_id":42675173720322,"sku":"12449","price":93150.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-biocalce-silicato-fondo-tiszta-szilikat-festekek-es-bevonatok-37153588445442.jpg?v=1702746551"},{"product_id":"kerakoll-biocalce-silicato-fondo-fino","title":"Kerakoll Biocalce Silicato Fondo Fino breathable leveling primer","description":"\u003cp\u003e Certified, eco-compatible pure stabilized potassium silicate-based, natural intermediate unifying primer, ideal for GreenBuilding and for the restoration of monuments.\u003c\/p\u003e\n\n\u003cp\u003e Contains only natural ingredients. It has natural ventilation, actively dilutes concentrated indoor pollutants, has a natural anti-bacterial and anti-fungal effect, is environmentally friendly and protects the health of users.\u003c\/p\u003e\n\n\u003cp\u003e Biocalce® Silicato Fondo Fino is particularly suitable for the uniform absorption of mineral substrates without changing the strength and uniformity of the lower surfaces before the subsequent decorative silicate process. In accordance with DIN 18363, it is naturally protected with pine oil.\u003c\/p\u003e\n\n\u003ctable\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n \u003cth\u003eWrapping\u003c\/th\u003e\n\n\u003ctd\u003e Bucket 14 ℓ \/ 4 ℓ\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 ≈ 0.1 – 0.2 ℓ\/m \u003csup\u003e2\u003c\/sup\u003e for one 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 ≈ 6 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":"4 L (27 m²)","offer_id":43325760831746,"sku":"05056","price":32500.0,"currency_code":"HUF","in_stock":true},{"title":"14 L (93 m²)","offer_id":42675190038786,"sku":"12450","price":104250.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-biocalce-silicato-fondo-fino-tiszta-szilikat-festekek-es-bevonatok-37153634451714.jpg?v=1702746555"},{"product_id":"kerakoll-biocalce-fondo","title":"Kerakoll Biocalce Fondo breathable filling lime primer","description":"\u003cp\u003eCertified, eco-compatible, selected CL 90‑S pure lime mortar according to EN 459‑1 standard and selected inert-based mineral intermediate filling base, ideal for GreenBuilding and for the restoration of monuments.\u003c\/p\u003e\n\u003cp\u003eIt has a natural antibacterial and antifungal effect. Contains only natural ingredients. It has natural ventilation, actively dilutes pollutants concentrated indoors, is environmentally friendly and protects the health of users.\u003c\/p\u003e\n\u003cp\u003eKerakoll Biocalce Fondo for uneven or micro-cracked substrates before applying breathable calcareous decoration cycles; lime mortar ensures state-preserving interventions with respect for existing structures and original materials.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGuarantees the adhesion of lime-based decorations to plaster, plasterboard and old paint in interior applications\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eIt evens out the absorption of the substrate, thereby guaranteeing the uniform color of the subsequent paint layer\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePorous and breathable, it allows the walls to breathe\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eA high-performance filler for correction to repair imperfections in the substrate\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFine grain effect\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBacteriostatic and fungistatic product (CSTB method)**\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan style=\"font-weight: 400;\"\u003eWrapping\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd\u003eBucket 14 ℓ \/ 4 ℓ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan style=\"font-weight: 400;\"\u003eMaterial requirement\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd\u003e≈ 0,15 – 0,3 ℓ\/m\u003csup\u003e2\u003c\/sup\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan style=\"font-weight: 400;\"\u003eStorage\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd\u003e≈ 12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Kerakoll","offers":[{"title":"14 L","offer_id":42675279560962,"sku":"11509","price":66550.0,"currency_code":"HUF","in_stock":true},{"title":"4L","offer_id":43325752344834,"sku":"05057","price":21600.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-biocalce-fondo-mesztartalmu-festekek-es-bevonatok-37153946403074.jpg?v=1702746916"},{"product_id":"kerakoll-biocalce-fondo-universale","title":"Kerakoll Biocalce Fondo Universale breathable lime primer","description":"\u003cp\u003e Certified, eco‑compatible, selected CL 90‑S pure lime mortar and micronized natural casein universal unifying primer in accordance with the EN 459‑1 standard, ideal for GreenBuilding and for the restoration of monuments.\u003c\/p\u003e\n\n \u003cp\u003eContains only natural ingredients. It is environmentally friendly and protects the health of users.\u003c\/p\u003e\n\n\u003cp\u003e Biocalce® Fondo Universale guarantees the adhesion of lime-based decorative coatings to plaster surfaces or surfaces coated with synthetic paint, without changing the appearance of the material.\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 Bucket 14 ℓ \/ 4 ℓ\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 ≈ 0.15 – 0.25 ℓ\/m \u003csup\u003e2\u003c\/sup\u003e\n\n\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 ≈ 12 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":"4L \/ Normal","offer_id":43325754441986,"sku":"08410","price":20950.0,"currency_code":"HUF","in_stock":true},{"title":"14 L \/ Normal","offer_id":42675291521282,"sku":"08411","price":64150.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-biocalce-fondo-universale-mesztartalmu-festekek-es-bevonatok-37153983725826.jpg?v=1702746919"},{"product_id":"kerakoll-kerakover-acrilex-fondo","title":"Kerakoll Kerakover Acrilex Fondo crack-filling facade primer","description":"\u003cp\u003eAn intermediate primer of organic mineral origin for the preparation of surfaces before painting, ideal for GreenBuilding. Based on water-based acrylic resin, it protects the health of users.\u003c\/p\u003e\n\n\u003cp\u003e Due to its outstanding filling effect, Kerakoll Kerakover Acrilex Fondo is suitable for filling the gaps in the substrate and providing an outstanding aesthetic appearance. It is particularly suitable for filling stable hairline cracks and controlling the surface's absorbency. Indoors and outdoors.\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 Bucket 14 ℓ \/ 4 ℓ\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 ≈ 0.1 – 0.2 ℓ\/m \u003csup\u003e2\u003c\/sup\u003e for one 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 ≈ 18 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":"14 L","offer_id":42742488334594,"sku":"20007","price":68600.0,"currency_code":"HUF","in_stock":true},{"title":"4L","offer_id":43325669802242,"sku":"26350","price":23600.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-kerakover-acrilex-fondo-kulteri-akril-festekek-es-bevonatok-37250892005634.jpg?v=1702740069"},{"product_id":"kerakoll-kerakover-eco-silox-fondo","title":"Kerakoll Kerakover Silox Fondo breathable facade filler primer","description":"\u003cp\u003eEco-compatible organic mineral-based, water-based acrylic-siloxane intermediate primer for surface preparation before painting. Ideal for GreenBuilding. Environmentally friendly and protects users' health.\u003c\/p\u003e\n\u003cp\u003eKerakoll Kerakover Silox Fondo features outstanding breathability and filling properties, making it especially suitable for filling stable hairline cracks, correcting substrate irregularities, and ensuring excellent aesthetic appearance. For interior and exterior use.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePackaging\u003c\/th\u003e\n\u003ctd\u003eBucket 14 ℓ \/ 4 ℓ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial consumption\u003c\/th\u003e\n\u003ctd\u003e≈ 0.1 – 0.2 ℓ\/m\u003csup\u003e2\u003c\/sup\u003e on average per application layer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003e≈ 18 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Kerakoll","offers":[{"title":"White \/ 14 L","offer_id":42748368126210,"sku":"24581","price":101200.0,"currency_code":"HUF","in_stock":true},{"title":"White \/ 4L","offer_id":43323763785986,"sku":"26598","price":31650.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-kerakover-eco-silox-fondo-kulteri-sziloxanos-festekek-es-bevonatok-37255953776898.jpg?v=1702739713"},{"product_id":"kerakoll-keradecor-eco-sintolite","title":"Kerakoll Keradecor Eco Sintolite wood-metal filler primer","description":"\u003cp\u003e Eco‑compatible mineral organic base layer preparation, ideal for GreenBuilding. It is environmentally friendly and protects the health of users.\u003c\/p\u003e\n\n\u003cp\u003e Kerakoll Keradecor Eco Sintolite is a solvent-based filling primer, suitable for wooden and iron surfaces. Levels the surfaces before applying the next layer of enamel. Indoors and outdoors.\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\u003e2.5 ℓ - 0.5 ℓ 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 ≈ 0.1 – 0.15 ℓ \/m \u003csup\u003e2\u003c\/sup\u003e for two layers\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":"0.5 L (4 m²)","offer_id":43323526349058,"sku":"23351","price":6150.0,"currency_code":"HUF","in_stock":true},{"title":"2.5 L (20 m²)","offer_id":42756129390850,"sku":"23350","price":23700.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-keradecor-eco-sintolite-lakkok-es-festekek-37266486657282.jpg?v=1702740981"},{"product_id":"kerakoll-bioscud-primer","title":"Kerakoll Bioscud Primer waterproofing system adhesion promoter","description":"\u003cp\u003e One-component, solvent-based adhesion promoter for preparing non-absorbent or slightly absorbent and very compact substrates before applying Bioscud, Bioscud BT and Bioscud Fiber.\u003c\/p\u003e\n\n\u003cp\u003e Kerakoll Bioscud Primer is particularly suitable for old, preformed bitumen skins, ceramic and stone tile floors, concrete and wood. Provides special adhesion values ​​for waterproofing 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 bucket 4 ℓ\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 on concrete ≈ 200 – 300 ml\/m \u003csup\u003e2\u003c\/sup\u003e\u003cbr\u003e old bituminous preformed coating ≈ 50 ‑ 100 ml\/m \u003csup\u003e2\u003c\/sup\u003e\u003cbr\u003e on polished wood ≈ 250 ml\/m \u003csup\u003e2\u003c\/sup\u003e\n\n\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 ≈ 12 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":42827939021058,"sku":"18865","price":37350.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerakoll-bioscud-primer-folyekony-membranok-37364313293058.jpg?v=1702745469"},{"product_id":"kerablock-eco","title":"Kerakoll Kerablock Eco indoor vapor barrier protective primer","description":"\u003cp\u003e Environmentally friendly, water-based vapor barrier and waterproofing protection for compact absorbent and non-absorbent substrates, ideal for use in GreenBuilding.\u003c\/p\u003e\n\n\u003cp\u003e Kerablock Eco develops an extended coverage time, so high-adhesion mineral waterproofing products can be safely and easily applied, even when covering.\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 5 kg box packaging\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e\n\n\u003cmeta charset=\"UTF-8\"\u003e\n\n \u003cspan\u003eMaterial requirement\u003c\/span\u003e\n\n\u003c\/th\u003e\n\n\u003ctd\u003e 0.2 - 0.4 kg\/m2\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e\n\n\u003cmeta charset=\"UTF-8\"\u003e\n\n \u003cspan\u003eStorage\u003c\/span\u003e\n\n\u003c\/th\u003e\n\n\u003ctd\u003e 12 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":"5kg","offer_id":43532402950402,"sku":"07483","price":48500.0,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/8027\/4946\/files\/kerablock-eco-vizszigetelo-termekek-es-a-rendszer-kiegeszitoi-38772614201602.jpg?v=1702747986"}],"url":"https:\/\/www.masterworks.hu\/en\/collections\/alapozok-specialis-alapozo.oembed","provider":"Masterworks Hungary","version":"1.0","type":"link"}