{"product_id":"smooth-on-thixotropic-agent-silicone-thickener-pint-bottle-brushable-prevents-sagging","title":"Smooth-On Thixotropic Agent Silicone Thickener, Pint Bottle — Brushable, Prevents Sagging","description":"\u003cp\u003e\u003cstrong\u003eTHI-VEX is Smooth-On’s thixotropic thickening agent designed to turn pourable silicone into a brushable, vertical-surface silicone for making durable brush-on moulds.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen you need silicone that will cling to walls, undercuts, or vertical sculpted surfaces, THI-VEX lets you control the body of Smooth-On silicones so they stay in place during brush application. It’s formulated to be mixed into Part A of two-component silicone systems, then blended with Part B; by adjusting the amount you add, you can achieve a range of viscosities from slightly body-enhanced to paste-like. Note that THI-VEX is not compatible with Mould Max 40 or Mould Max 60.\u003c\/p\u003e\n\n\u003ch3\u003eHow does THI-VEX change silicone behavior for brush-on moulds?\u003c\/h3\u003e\n\u003cp\u003eTHI-VEX increases the thixotropy of Smooth-On silicones so the mixture resists sagging yet flows under shear during brushing. This gives a stable, buildable layer that captures detail without running off vertical surfaces.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAdds body to liquid silicone for layer-by-layer brush application.\u003c\/li\u003e\n  \u003cli\u003ePrevents sagging or dripping on undercuts and edges.\u003c\/li\u003e\n  \u003cli\u003ePreserves surface detail while allowing workable open time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow much THI-VEX should I add to get the right thickness?\u003c\/h3\u003e\n\u003cp\u003eViscosity depends on the amount of THI-VEX relative to Part A; small increments create slightly thicker fluid, larger percentages produce paste-like consistency. Start with a low percentage and test on a sample to dial in the ideal feel for your particular silicone and project.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBegin with a conservative percentage of THI-VEX to Part A and increase as needed.\u003c\/li\u003e\n  \u003cli\u003eMix thoroughly into Part A before combining Parts A and B for even texture.\u003c\/li\u003e\n  \u003cli\u003eTest a sample coat to verify brushability and cure before full application.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich silicones and processes are compatible with THI-VEX?\u003c\/h3\u003e\n\u003cp\u003eTHI-VEX is formulated for use with most Smooth-On silicone systems that require thixotropic modification for brush-on moldmaking. It must be mixed into Part A and then combined with Part B for proper cure. Do not use it with Mould Max 40 or Mould Max 60, as it will not function with those formulations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks with many Smooth-On two-part silicone rubbers when added to Part A.\u003c\/li\u003e\n  \u003cli\u003eNot compatible with Mould Max 40 or Mould Max 60 — avoid mixing with those products.\u003c\/li\u003e\n  \u003cli\u003eRequires thorough mixing of Parts A and B after THI-VEX addition for uniform cure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat practical tips improve results when using THI-VEX?\u003c\/h3\u003e\n\u003cp\u003eGood results come from measured additions, thorough mixing, and testing. Use a clean container and tools, mix THI-VEX into Part A until homogeneous, then combine with Part B and apply in thin, consistent layers to build thickness without entrapped air.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeasure THI-VEX by weight or volume for reproducible viscosity control.\u003c\/li\u003e\n  \u003cli\u003eMix Part A and THI-VEX thoroughly before adding Part B to avoid streaks.\u003c\/li\u003e\n  \u003cli\u003eApply multiple thin coats, allowing recommended cure time between layers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? THI-VEX is aimed at moldmakers, prop fabricators, sculptors, and restoration professionals who need a brushable silicone that holds on vertical and complex surfaces. If your workflow requires building up rubber over a form, capturing fine surface detail on undercuts, or converting pourable silicone into a paste or butter-like consistency for hand application, THI-VEX provides a controlled, studio-friendly way to get there — provided you avoid incompatible Mould Max 40\/60 silicones and follow proper mixing practice.\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 THI-VEX be used with any Smooth-On silicone?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: THI-VEX works with many Smooth-On silicones when added to Part A, but it is not compatible with Mould Max 40 or Mould Max 60.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I mix THI-VEX into my silicone?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Blend THI-VEX thoroughly into Part A first, then mix Parts A and B uniformly; start with small amounts and test viscosity.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Smooth-On","offers":[{"title":"Default Title","offer_id":55296670957905,"sku":"B01ACAHUR8","price":60.13,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1086\/5567\/3681\/files\/smooth-on-thi-vex-front-pint-bottle.jpg?v=1791945213","url":"https:\/\/craftiche.co.uk\/products\/smooth-on-thixotropic-agent-silicone-thickener-pint-bottle-brushable-prevents-sagging","provider":"Craftiche","version":"1.0","type":"link"}