{"product_id":"mirka-wpf-pro-p400-9-in-x-11-in-sandpaper-sheets-for-wet-sanding-50-pack-21-101-p400","title":"Mirka WPF Pro P400 9-in. x 11-in. Sandpaper Sheets for Wet Sanding, 50-Pack (21-101-P400)","description":"\u003csection data-aplus\u003e\u003cdetails id=\"product-features\" class=\"acc\" open\u003e\u003csummary\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\"\u003e\u003cdiv class=\"features\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cdiv class=\"card-inside\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/grit-range.svg\" alt=\"grit-range\" class=\"aplusicon\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eP400 Fine Finish\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003eThe P400 grit is built for refining surfaces before paint or topcoat. It helps leave a controlled scratch pattern that is easier to polish out and easier to cover cleanly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cdiv class=\"card-inside\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/material.svg\" alt=\"material\" class=\"aplusicon\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eWet Sanding Ready\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003eThis waterproof abrasive is made for manual wet sanding on paints, primers, lacquer, metal, and composite materials. That means smoother sanding action and less downtime from paper that softens or curls up early.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cdiv class=\"card-inside\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/size.svg\" alt=\"size\" class=\"aplusicon\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e9 x 11 Sheet Format\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003eThe Mirka WPF PRO 9 in x 11 in sandpaper sheet gives you a familiar full-sheet format for hand sanding, block sanding, and trimming to fit the work. Good size, easy to handle, and practical for repair work.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails id=\"product-overview\" class=\"acc\"\u003e\u003csummary\u003e\u003ch2\u003eOverview\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\" data-product-summary\u003e\n\u003cp\u003eThe Mirka WPF PRO 9 in x 11 in Plain P400 Sandpaper Sheet, model 21-101-P400, is a waterproof abrasive sheet for fine sanding and surface prep. This is a sandpaper sheet designed for manual wet sanding and finish refinement. If you are working on paint, primer, lacquer, metal, wood, putty, or composite materials, this sheet is built to keep the cut consistent while helping you get to a cleaner finished surface.\u003c\/p\u003e\n\u003cp\u003eWhat matters here is not just that it is P400 grit, but what that grit does in real work. Fine grit like this is typically used when you are past heavy material removal and into the stage where surface quality starts to matter more than speed. The scratch pattern is described as highly polishable, which is exactly what you want when sanding between coats, refining primer, or preparing a panel or part for topcoat.\u003c\/p\u003e\n\u003cp\u003eMirka positions the WPF Pro line as a high-quality waterproof abrasive with a lasting aggressive cut. In practical terms, that means the sheet is made to keep working instead of falling off fast once moisture is involved. It is also described as curl resistant and non-absorbent, which is important for wet sanding because paper that swells, curls, or goes soft gets frustrating fast and makes it harder to keep pressure even across the surface.\u003c\/p\u003e\n\u003cp\u003eThe C-weight latex paper backing is there for flexibility. That matters when you are sanding curves, contours, body lines, edges, or repair areas where a stiff sheet can leave uneven contact. A more flexible backing helps the abrasive follow the surface better, especially when used by hand or wrapped around a sanding block.\u003c\/p\u003e\n\u003cp\u003eThis Mirka abrasive sheet is suited for manual sanding jobs across several materials, including paints, primers, lacquer, metal, composite materials, putty, and wood. That makes it a practical choice for auto body repair, paint prep, finish sanding, and general shop work where wet sanding is part of the process. Because it is a plain full sheet format, you can use it as-is, fold it, or cut it down to fit the task.\u003c\/p\u003e\n\u003cp\u003eIf you are the kind of buyer who cares more about finish quality than flashy packaging, this is the kind of abrasive worth paying attention to. The Mirka WPF PRO 9 in x 11 in Plain P400 Sandpaper Sheet makes the most sense for painters, body techs, refinishers, woodworkers, and serious DIY users who need a reliable wet sanding sheet that holds up, stays manageable in the hand, and leaves a fine surface ready for the next step.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003cdetails id=\"product-whats-included\" class=\"acc\" open\u003e\u003csummary\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\"\u003e\u003cdiv class=\"tnincluded-wrapper\"\u003e\u003cul\u003e\u003cli\u003e(50) Mirka WPF PRO 9 in x 11 in Plain P400 sandpaper sheets\u003c\/li\u003e\u003c\/ul\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails id=\"product-key-specifications\" class=\"acc\" open\u003e\u003csummary\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\"\u003e\u003ctable class=\"aplusspecs\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eWaterproof sandpaper sheets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSheet Size\u003c\/th\u003e\n\u003ctd\u003e9 in x 11 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrit\u003c\/th\u003e\n\u003ctd\u003eP400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBacking Material\u003c\/th\u003e\n\u003ctd\u003eC-weight latex paper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSheet Style\u003c\/th\u003e\n\u003ctd\u003ePlain sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse Type\u003c\/th\u003e\n\u003ctd\u003eManual wet sanding\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackage Quantity\u003c\/th\u003e\n\u003ctd\u003e50 sheets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial Compatibility\u003c\/th\u003e\n\u003ctd\u003ePaint, primer, lacquer, metal, composite, putty, and wood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails id=\"product-applications-uses\" class=\"acc\"\u003e\u003csummary\u003e\u003ch2\u003eBuilt For\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\"\u003e\u003cdiv class=\"tags\"\u003e\n\u003cspan class=\"tag\"\u003eAutomotive\u003c\/span\u003e\u003cspan class=\"tag\"\u003ePainting\u003c\/span\u003e\u003cspan class=\"tag\"\u003eWoodworking\u003c\/span\u003e\u003cspan class=\"tag\"\u003eRefinishing\u003c\/span\u003e\u003cspan class=\"tag\"\u003eWet Sanding\u003c\/span\u003e\u003cspan class=\"tag\"\u003ePrimer Sanding\u003c\/span\u003e\u003cspan class=\"tag\"\u003eTopcoat Prep\u003c\/span\u003e\u003cspan class=\"tag\"\u003eDIY \/ Hobbyist\u003c\/span\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails id=\"product-pro-tips\" class=\"acc\"\u003e\u003csummary\u003e\u003ch2\u003ePro Tip\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\"\u003e\u003cdiv class=\"tip-row\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/specs.svg\" alt=\"specs\" class=\"icon-lg\"\u003e\u003cp class=\"tip-text\"\u003eWith a P400 sheet like this, let the grit do the work. Keep the surface and sheet wet, use light pressure, and clean the slurry often so you do not grind loosened material back into the finish.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails id=\"product-faqs\" class=\"acc\"\u003e\u003csummary\u003e\u003ch2\u003eCommon Questions\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\"\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs this sandpaper made for wet sanding?\u003c\/strong\u003e Yes. The WPF Pro is a waterproof abrasive specifically suited for manual wet sanding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat materials can it be used on?\u003c\/strong\u003e It is suited for paints, primers, lacquer, metal, composite materials, putty, and wood.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat does P400 grit make it good for?\u003c\/strong\u003e P400 is a fine grit typically used for finish sanding, surface refinement, and prep before final coating or polishing steps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs this a full sheet or a hook and loop disc?\u003c\/strong\u003e This is a plain 9 in x 11 in sheet, not a disc.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails id=\"product-tool-nut-take\" class=\"acc\"\u003e\u003csummary\u003e\u003ch2\u003eTool Nut's Take\u003c\/h2\u003e\u003c\/summary\u003e\u003cdiv class=\"acc-body\"\u003e\n\u003cdiv class=\"eyebrow\"\u003eTool Nut's Take\u003c\/div\u003e\n\u003ch3\u003eSimple Sheet, Serious Finish Work\u003c\/h3\u003e\n\u003cp\u003eThe Mirka WPF PRO 9 in x 11 in Plain P400 Sandpaper Sheet is a smart buy if you need dependable wet sanding paper that stays usable and leaves a cleaner finish than bargain-bin sheets.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWho it's for:\u003c\/strong\u003e Painters, body techs, refinishers, woodworkers, and detail-minded DIY users doing fine prep work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy it stands out:\u003c\/strong\u003e Waterproof construction, flexible C-weight latex paper backing, and a polishable fine scratch pattern make it a strong choice for finish-stage sanding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorth knowing:\u003c\/strong\u003e This is a manual full-sheet abrasive, so it is best for hand work or cutting to fit a block, not for random orbital sanding.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003c\/section\u003e","brand":"Mirka","offers":[{"title":"Default Title","offer_id":53385934962982,"sku":"21-101-P400-MIRKA","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/20260624002_1.jpg?v=1782171957","url":"https:\/\/www.toolnut.com\/products\/mirka-wpf-pro-p400-9-in-x-11-in-sandpaper-sheets-for-wet-sanding-50-pack-21-101-p400","provider":"Tool Nut","version":"1.0","type":"link"}