{"product_id":"tsi-supercool-radiator-uv-leak-detection-dye-purple-8-oz-self-measure-bottle-water-based","title":"TSI Supercool Radiator UV Leak Detection Dye — Purple 8 oz Self-Measure Bottle, Water-Based","description":"\u003cp\u003e\u003cstrong\u003eTSI Supercool RD8 is an 8-ounce, water-based purple UV-detectable radiator dye in a self-measuring bottle designed to locate cooling system leaks quickly and precisely.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you suspect a coolant leak but can't see obvious drips or stains, adding a UV-reactive dye to the radiator or coolant reservoir makes small leaks visible under a UV lamp. The RD8 formula is synthetic, water-compatible, and engineered to show up under any U\/V light so you can trace the source without disassembling large sections of the engine. Its self-measure bottle lets you dispense the recommended 1 ounce per vehicle without extra tools, saving time in garages, home workshops, or roadside troubleshooting.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the dye reveal hidden cooling system leaks?\u003c\/h3\u003e\n\n\u003cp\u003eWhen added to the coolant, the RD8 dye circulates with the system fluid. Any escaping fluid deposits the purple dye at the leak point, which fluoresces brightly under a UV lamp and pinpoints hairline cracks, gasket failures, or loose hose clamps. This visual cue reduces guesswork and helps you find leaks faster than pressure testing alone.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMixes with water-cooled systems and travels with coolant flow\u003c\/li\u003e\n  \u003cli\u003eFluoresces under standard U\/V lights for easy detection\u003c\/li\u003e\n  \u003cli\u003eHighlights small leaks invisible to the naked eye\u003c\/li\u003e\n  \u003cli\u003eWorks on hoses, radiators, gaskets and fittings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow much dye do I need and how do I use it safely?\u003c\/h3\u003e\n\n\u003cp\u003eRD8 is packaged in a user-friendly self-measure bottle and the typical dose is 1 ounce per vehicle, which is enough for most passenger cars and light trucks. Add the dye to the coolant reservoir or radiator when the engine is cool, circulate the system briefly, then inspect with a UV lamp. Follow all safety precautions for working with hot engines and coolant; avoid direct skin or eye contact and properly dispose of any waste coolant.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDosage: 1 ounce per vehicle (8-ounce bottle covers multiple uses)\u003c\/li\u003e\n  \u003cli\u003eApplication: add to coolant reservoir or radiator when cool\u003c\/li\u003e\n  \u003cli\u003eInspection: run engine briefly, then scan with U\/V light\u003c\/li\u003e\n  \u003cli\u003eSafety: avoid skin\/eye contact; follow coolant handling guidelines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this dye compatible with my cooling system and detection tools?\u003c\/h3\u003e\n\n\u003cp\u003eRD8 is water-based and formulated for use in water-cooled engines; it’s designed to be compatible with common cooling system materials. The dye is detectable with any standard U\/V lamp, so it works with professional leak-finding lights or handheld UV flashlights used by DIYers. As with any additive, check vehicle manufacturer guidance if a specific coolant chemistry is required.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWater-based formula for water-cooled systems\u003c\/li\u003e\n  \u003cli\u003eDetectable with standard U\/V lights and flashlights\u003c\/li\u003e\n  \u003cli\u003eSuitable for radiators, hoses, heater cores and fittings\u003c\/li\u003e\n  \u003cli\u003eConsult manufacturer requirements for specialized coolants\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow quickly will I find a leak after adding the dye?\u003c\/h3\u003e\n\n\u003cp\u003eMany leaks become visible within minutes of circulating the system, but some slow or intermittent leaks may take longer or require short road tests. After adding RD8 and running the engine, inspect likely leak points under a UV lamp; repeat checks after a brief drive for systems where leaks appear only under pressure or temperature cycles.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eQuick leaks often show within minutes of circulation\u003c\/li\u003e\n  \u003cli\u003eSlow or pressure-dependent leaks may need a short drive\u003c\/li\u003e\n  \u003cli\u003eInspect radiator, hoses, clamps, gaskets and heater core areas\u003c\/li\u003e\n  \u003cli\u003eRecheck after cooling to catch residual traces\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: TSI Supercool RD8 is intended for mechanics, fleet technicians, and vehicle owners who need a straightforward, reliable way to detect coolant leaks without invasive disassembly. The self-measure bottle and one-ounce dosing make it convenient for shop use and home mechanics alike, while compatibility with standard UV lights ensures quick, accurate leak location across a wide range of water-cooled vehicles.\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: How much RD8 dye do I add per vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use 1 ounce of RD8 per vehicle; the 8-ounce bottle provides multiple applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will the dye work with any UV light?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. RD8 fluoresces under standard U\/V lamps and handheld UV flashlights.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TSI Supercool","offers":[{"title":"Default Title","offer_id":55165627072855,"sku":"B008PKWEHY","price":33.64,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/tsi-supercool-rd8-front-packaging.jpg?v=1790356586","url":"https:\/\/britishgarage.co.uk\/products\/tsi-supercool-radiator-uv-leak-detection-dye-purple-8-oz-self-measure-bottle-water-based","provider":"British Garage","version":"1.0","type":"link"}