{"product_id":"schluter-primer-u-universal-primer","title":"Schluter® PRIMER-U Universal Primer","description":"\u003cp\u003ePRIMER-U is Schluter's universal primer — a ready-to-use, water-based formula that improves the bond of thin-set mortar to substrates that resist adhesion. Where PRIMER-PS is specifically for peel-and-stick membranes, PRIMER-U works with standard mortar-set Schluter products (DITRA, KERDI, KERDI-BOARD) and general tile installation.\u003c\/p\u003e\n\n\u003cp\u003eUse it when your substrate is too smooth, too dense, or has residual contamination that would compromise mortar adhesion. It creates a bonding bridge between the substrate and the thin-set.\u003c\/p\u003e\n\n\u003ch4\u003eWhen to use PRIMER-U\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDense concrete:\u003c\/strong\u003e Machine-troweled or power-floated slabs that are too smooth for mortar to grip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExisting tile or stone:\u003c\/strong\u003e When tiling over existing surfaces without removing them\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-porous surfaces:\u003c\/strong\u003e Metal, glass, or coated substrates\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContaminated substrates:\u003c\/strong\u003e Surfaces with residual adhesive, paint, or curing compounds that can't be fully removed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhen unsure:\u003c\/strong\u003e Primer is cheap insurance — if the substrate feels slick or sealed, prime it\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eApplication\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eStir well — do NOT dilute\u003c\/li\u003e\n\u003cli\u003eApply one thin, even coat with a roller, brush, or sprayer\u003c\/li\u003e\n\u003cli\u003eLet dry to a clear, tacky film (typically 30–60 min depending on conditions)\u003c\/li\u003e\n\u003cli\u003eApply thin-set mortar while primer is still tacky (within the open time window)\u003c\/li\u003e\n\u003cli\u003eRoom temp 40–85°F, humidity below 80%\u003c\/li\u003e\n\u003cli\u003eCoverage: ~200–350 sq ft per gallon\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecs\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eType: Ready-to-use, water-based universal primer\u003c\/li\u003e\n\u003cli\u003eCompatible with: Standard mortar-set DITRA, KERDI, KERDI-BOARD, general tile\u003c\/li\u003e\n\u003cli\u003eNot for: Peel-and-stick membranes (use PRIMER-PS instead)\u003c\/li\u003e\n\u003cli\u003eCoverage: ~200–350 sq ft\/gallon\u003c\/li\u003e\n\u003cli\u003eShelf life: 12 months from manufacture\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003ePRIMER-PS vs. PRIMER-U — which one?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePRIMER-PS:\u003c\/strong\u003e For peel-and-stick (-PS) membranes only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePRIMER-U:\u003c\/strong\u003e For everything else — mortar-set membranes, tile, KERDI-BOARD\u003c\/li\u003e\n\u003cli\u003eThey're not interchangeable. Using the wrong one won't necessarily fail, but it won't perform as tested and may void the Schluter warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003ePairs with\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDITRA, KERDI, KERDI-BOARD — mortar-set membranes\u003c\/li\u003e\n\u003cli\u003eSchluter SET, ALL-SET, or FAST-SET mortar\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Schluter","offers":[{"title":"1 Gallon (3.78 L)","offer_id":48064068616359,"sku":"PRMU1","price":93.65,"currency_code":"CAD","in_stock":true},{"title":"1 Quart (946 mL)","offer_id":48064068649127,"sku":"PRMUQT1","price":35.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0569\/3954\/4743\/files\/PRIMER-U-1-gallon.jpg?v=1773093364","url":"https:\/\/www.yourfloors.ca\/products\/schluter-primer-u-universal-primer","provider":"yourfloors","version":"1.0","type":"link"}