{"product_id":"tsi-supercool-radiator-leak-detection-dye-purple-8-oz-uv-reactive-self-measure-bottle","title":"TSI Supercool Radiator Leak Detection Dye, Purple 8 oz — UV-Reactive Self-Measure Bottle","description":"\u003cp\u003e\u003cstrong\u003eTSI Supercool RD8 is an 8-ounce purple UV-reactive coolant dye in a self-measuring bottle used to quickly reveal leaks in water-cooled radiators and engine cooling systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen you suspect a slow coolant leak, identifying the exact source fast saves time and prevents larger repairs. The RD8 formula mixes with radiator fluid and fluoresces under any UV light, making it simple to track down seepage, hairline cracks, or hose and gasket failures. The convenient self-measure bottle dispenses one-ounce increments so you add the correct amount without guesswork.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I use RD8 to find a radiator leak?\u003c\/h3\u003e\n\u003cp\u003eAdd the dye to your cooling system while the engine is cool and run the vehicle briefly to circulate the product. Inspect visible components with a UV lamp—leaking areas will glow brightly. Follow safety guidance: let the radiator cool before opening and avoid skin or eye contact.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse 1 ounce per vehicle as a starting dose.\u003c\/li\u003e\n  \u003cli\u003ePour from the self-measure bottle to avoid overuse.\u003c\/li\u003e\n  \u003cli\u003eOperate engine briefly to distribute dye, then scan with a UV light.\u003c\/li\u003e\n  \u003cli\u003eCheck hoses, clamps, radiator seams, water pump, and heater core area.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill RD8 work with any UV light and coolant type?\u003c\/h3\u003e\n\u003cp\u003eYes—the RD8 dye is formulated to fluoresce with standard UV\/black lights commonly used in shops and by DIYers. It mixes with typical ethylene or propylene glycol-based coolants and water mixtures used in most water-cooled engines. Avoid mixing incompatible additives before testing to prevent masking results.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with common glycol-based antifreezes.\u003c\/li\u003e\n  \u003cli\u003eDetectable using handheld UV lamps or shop-grade black lights.\u003c\/li\u003e\n  \u003cli\u003eWorks in both closed-loop and open cooling systems.\u003c\/li\u003e\n  \u003cli\u003eDo not combine with other leak dyes simultaneously.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow much dye should I use and how long until I can inspect?\u003c\/h3\u003e\n\u003cp\u003eThe self-measure bottle makes dosing simple: use roughly 1 ounce per vehicle as directed for most passenger vehicles. After adding, run the engine for a short period to circulate the dye; small leaks often become visible immediately while slower leaks may require a few driving cycles to show. Clean affected areas with water and inspect under UV light for the clearest results.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTypical starting dose: 1 ounce per vehicle.\u003c\/li\u003e\n  \u003cli\u003eShort engine run usually sufficient; repeat after driving if needed.\u003c\/li\u003e\n  \u003cli\u003eWipe grime from suspect areas for better fluorescence visibility.\u003c\/li\u003e\n  \u003cli\u003eStore remaining product in a cool, sealed place away from direct sunlight.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDoes RD8 affect cooling system performance or require system flushing afterward?\u003c\/h3\u003e\n\u003cp\u003eRD8 is designed as a diagnostic dye and is compatible with cooling system fluids when used at recommended amounts. It does not permanently alter fluid performance when used for leak detection, but many technicians prefer to perform a routine coolant change if the system needs repair or contamination is suspected. Always follow manufacturer service intervals and disposal recommendations for coolant fluids.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFormulated to be safe for short-term diagnostic use at recommended doses.\u003c\/li\u003e\n  \u003cli\u003eConsider a coolant flush if repairs are made or if contamination occurred.\u003c\/li\u003e\n  \u003cli\u003eAdhere to local disposal rules for used coolant and dye-contaminated fluids.\u003c\/li\u003e\n  \u003cli\u003eKeep away from skin and eyes; use protective gloves and eyewear when handling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: RD8 is aimed at mechanics, service technicians, and hands-on vehicle owners who want a fast, visible way to locate coolant leaks without dismantling the entire cooling system. It’s useful for shop diagnostics, roadside troubleshooting, and routine maintenance checks where pinpointing a leak quickly reduces labor and repair costs. If you need a compact, easy-to-use UV-reactive coolant dye in a self-dosing bottle, the TSI Supercool RD8 is built for that task.\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 to my car?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use about 1 ounce per vehicle as the standard starting dose from the self-measure bottle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I see leaks with a household UV flashlight?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes; most handheld UV or black lights will reveal the RD8 dye fluorescence on leaking areas.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TSI Supercool","offers":[{"title":"Default Title","offer_id":48086892183710,"sku":"B008PKWEHY","price":32.75,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/tsi-supercool-rd8-front-packaging.jpg?v=1785909253","url":"https:\/\/northtrailauto.ca\/products\/tsi-supercool-radiator-leak-detection-dye-purple-8-oz-uv-reactive-self-measure-bottle","provider":"North Trail Auto","version":"1.0","type":"link"}