{"product_id":"smooth-on-smooth-cast-325-liquid-plastic-resin-clear-amber-1-9-lb-fast-cure-1-1-mix","title":"Smooth-On Smooth-Cast 325 liquid plastic resin, Clear Amber 862 g — fast-cure, 1:1 mix","description":"\u003cstrong\u003eSmooth-On Smooth-Cast 325 is a fast-cure, colour-neutral liquid plastic resin designed for mixing with pigments and fillers to produce clear amber castings with accurate, vivid colours.\u003c\/strong\u003e\n\n\u003cp\u003eThis one-to-one, easy-to-pour casting kit cures quickly and is built for projects that require predictable colour results, fine detail, and a moderately hard finish. Smooth-Cast 325 was formulated to accept small amounts of colorants and metallic powders with minimal influence from the base resin colour; that makes it especially useful for marbling, faux metal finishes, and colour-true castings. With a short pot life and fast demold, it speeds production for small-to-medium sized parts while delivering a Shore D hardness around 72.\u003c\/p\u003e\n\n\u003ch3\u003eHow fast does Smooth-Cast 325 work for quick-turn projects?\u003c\/h3\u003e\n\u003cp\u003eThe system is optimised for speed: you get roughly a 3-minute pot life and parts can often be demolded in about 10 minutes, depending on ambient temperature and part size. That rapid schedule reduces wait time and increases throughput for repeated pours.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMix ratio: 1:1 by volume for simple measuring and less waste\u003c\/li\u003e\n  \u003cli\u003ePot life: ~3 minutes for quick mixing and pouring\u003c\/li\u003e\n  \u003cli\u003eDemold time: ~10 minutes under typical conditions\u003c\/li\u003e\n  \u003cli\u003eCure sensitivity: faster in warm environments, slower in cool\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat finishing and aesthetic options can I achieve with this clear amber resin?\u003c\/h3\u003e\n\u003cp\u003eBecause Smooth-Cast 325 is formulated to be colour-neutral, it accepts pigments and metal powders without significant colour shift from the base resin. This makes it ideal for creating marble or wood-grain effects, translucent amber tones, or metallic-looking castings when combined with bronze\/brass powders.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse Smooth-On SO-Strong pigments for bright, accurate colours\u003c\/li\u003e\n  \u003cli\u003eAdd metal powders to simulate bronze, brass, and other finishes\u003c\/li\u003e\n  \u003cli\u003eCreate layered pours or marbling with small pigment amounts\u003c\/li\u003e\n  \u003cli\u003eClear amber base preserves translucency and enhances depth\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key mechanical and handling properties I should expect?\u003c\/h3\u003e\n\u003cp\u003eOnce cured, the material has a mixed viscosity around 100 cps and a Shore D hardness approximately 72, giving a firm, dimensionally stable part suitable for many display, prototype, and small production uses. The low-viscosity mix pours easily into detailed moulds but requires timely mixing and pouring due to the short pot life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMixed viscosity: ~100 cps for good mould flow\u003c\/li\u003e\n  \u003cli\u003eHardness: ~72D for a firm, durable surface\u003c\/li\u003e\n  \u003cli\u003ePouring: low viscosity helps capture fine detail\u003c\/li\u003e\n  \u003cli\u003eMixing: precise 1:1 ratio by volume reduces measurement errors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this product suits: Smooth-Cast 325 is aimed at hobbyists, prop makers, prototype fabricators, and small-batch manufacturers who need a fast-curing, pigment-friendly casting resin. It’s especially helpful when accurate colour matching or translucent effects matter—such as decorative items, small sculptures, model parts, or faux-metal finishes. Always work in a well-ventilated area, follow recommended safety procedures, and review the product MSDS on Smooth-On’s website before use.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I add pigment directly to Smooth-Cast 325?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The resin is colour-neutral and accepts small amounts of pigment—Smooth-On SO-Strong pigments are recommended for true, vivid colours.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is the mix ratio and working time?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Mix 1:1 by volume. Expect about a 3-minute pot life and roughly 10-minute demold time under typical conditions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Smooth-On","offers":[{"title":"Default Title","offer_id":55297290043729,"sku":"B008UG7R6Q","price":68.16,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1086\/5567\/3681\/files\/smooth-on-smooth-cast-325-front-packaging.jpg?v=1791952305","url":"https:\/\/craftiche.co.uk\/products\/smooth-on-smooth-cast-325-liquid-plastic-resin-clear-amber-1-9-lb-fast-cure-1-1-mix","provider":"Craftiche","version":"1.0","type":"link"}