{"product_id":"fast-set-postfix-concrete-20kg-bag","title":"Fast Set PostFix Concrete 20kg Bag","description":"\u003cp\u003eHeidelberg Materials Fast Set PostFix in a 20kg bag — a ready-to-use, fast-setting concrete mix of Portland cement and special additives, with sharp sand and 10mm aggregate, designed for fixing posts in the ground, with no pre-mixing required. Position the post, add water to the hole, and pour the bag straight in. Initial set takes under 5 minutes, after which the post stands unsupported, with full strength developing in around 4 hours. The quick, clean fix for fence posts, gate posts, pergolas, garden lighting and rotary lines. As a guide, allow 1 bag for a 75mm post and 1–3 bags for a 100mm post depending on hole width and depth. Sold per 20kg bag.\u003c\/p\u003e","brand":"S\u0026J Wackett","offers":[{"title":"Default Title","offer_id":47311174336687,"sku":null,"price":6.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6124\/0495\/files\/FAST-SET-POSTFIX-RGB.webp?v=1785928711","url":"https:\/\/www.sjwackett.co.uk\/products\/fast-set-postfix-concrete-20kg-bag","provider":"S\u0026J Wackett Timber Merchants","version":"1.0","type":"link"}