--- product_id: 743128412 title: "ComStar A/C Zero Leak, Permanent \"Stop Leak\" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700)" brand: "comstar" price: "£2.00" currency: GBP in_stock: false url: https://www.desertcart.co.uk/products/743128412-comstar-a-c-zero-leak-permanent-stop-leak-for-c store_origin: GB region: United Kingdom --- # Eco-friendly, polymer-free formula Compatible with all major A/C lubricants Stops leaks in evaporators & condensers ComStar A/C Zero Leak, Permanent "Stop Leak" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700) **Brand:** comstar **Price:** £2.00 **Availability:** ❌ Out of Stock ## Summary > ❄️ Seal the deal on leaks before they even start! ## Quick Answers - **What is this?** ComStar A/C Zero Leak, Permanent "Stop Leak" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700) by comstar - **How much does it cost?** £2.00 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/743128412-comstar-a-c-zero-leak-permanent-stop-leak-for-c) ## Best For - comstar enthusiasts ## Why This Product - Trusted comstar brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Eco-Conscious Formula:** Polymer-free and environmentally safe, so you maintain performance without compromise. - • **Universal Compatibility:** Works seamlessly with POE, PAG, and mineral oil-based A/C lubricants across automotive, commercial, and residential systems. - • **Long-Lasting Maintenance:** Designed to stay active inside operating systems, providing ongoing leak prevention. - • **Permanent Leak Protection:** Seals minor leaks instantly without hardening or clogging your A/C system. - • **Precision Dosage for Any System:** 4 oz treats up to 12-ton systems with clear guidelines for larger units—no guesswork, just results. ## Overview ComStar A/C Zero Leak is a 4 oz, polymer-free, eco-friendly leak sealant designed for automotive, commercial, and residential A/C systems. It instantly stops minor leaks in evaporators, condensers, gaskets, and seals without hardening or damaging components. Compatible with all major A/C lubricants, it offers permanent leak protection and can be used as preventative maintenance, making it a reliable, hassle-free solution made in the USA. ## Description ComStar A/C Zero Leak is specially formulated to prevent minor leaks around evaporators, condensers, gaskets and seals. Permanent "Leak Proof" for A/C System & Co-Friendly This environmentally safe product can be used in automotive, commercial and residential A/C applications. Can be used for preventative maintenance and can be left in the operating system. Designed to not harm A/C systems, it is non-hardening and polymer free. Compatible with POE-based, PAG-based, mineral oil based mobile AC lubricants A/C Zero Leak contains no polymers so you don't have to worry about jamming or jamming. This distinct advantage ensures that A/C Zero Leak does not form hard particles when it comes into contact with moisture in the system, unlike competitors. Commercial and residential A/C applications One 4 ounce bottle holds up to 12 ton systems A/C Zero Leak can be left in the operating system. For larger systems over 12 tons, use the appropriate ratio of about 1 ounce per 6 tons per original 12 ton. As an alternative to estimating how much dosage is needed, refer to the product attachments that indicate the dosage by the amount of refrigerant the system holds. ## Features - Specially developed to prevent minor leaks in evaporators, condensers, gaskets and seals - Environmentally safe and suitable for use in automotive, commercial and residential A/C applications - Designed to not harm A/C systems with non-hardening, polymer-free properties - Compatible with POE-based, PAG-based, mineral oil based mobile AC lubricants - Used for preventative maintenance and remains on operating systems ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | ComStar International, Inc. | | Part number | 90-700 | | Item Weight | 113 g | | Product Dimensions | 4.27 x 4.27 x 11.89 cm; 113.4 g | | Size | 4 Ounces | | Color | red | | Material | Silicone | | Item Thickness | 1.68 Inches | | Specific Uses For Product | Automotive, Commercial and Residential A/C Applications | | Included Components | Liquid | | Batteries Included | No | | Batteries Required? | No | | Item Dimensions LxWxH | 43 x 43 x 119 mm | ## Product Details - **Material:** Silicone - **Brand:** Comstar - **Package Information:** Plastic Containers - **Liquid Volume:** 4 Fluid Ounces - **Item Weight:** 4 Ounces ## Images ![ComStar A/C Zero Leak, Permanent "Stop Leak" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700) - Image 1](https://m.media-amazon.com/images/I/71fXGI+e6XL.jpg) ![ComStar A/C Zero Leak, Permanent "Stop Leak" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700) - Image 2](https://m.media-amazon.com/images/I/71sZmtB5dLL.jpg) ![ComStar A/C Zero Leak, Permanent "Stop Leak" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700) - Image 3](https://m.media-amazon.com/images/I/71hXwi7X-XL.jpg) ![ComStar A/C Zero Leak, Permanent "Stop Leak" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700) - Image 4](https://m.media-amazon.com/images/I/71nGiCjNzkS.jpg) ![ComStar A/C Zero Leak, Permanent "Stop Leak" for A/C Systems, Instant Leak Seal, Non-Cured, Polymer Free, Eco-Friendly, Made in the USA, 4 oz (90-700) - Image 5](https://m.media-amazon.com/images/I/81bDYhBs2MS.jpg) ## Questions & Answers **Q: I have a 4 ton system how many OZ will needed ?** A: A/C Zero Leak, as well as other types, uses the amount of refrigerant in a system to determine how much stop leak should be used, not by the size (Tons) of a system. The rule of thumb is 2 to 4 lbs of refrigerant per ton. Therefore, you need to find out how much refrigerant your system operates on. The minimum refrigerant in a 4-ton system would be 8 lb and the maximum would be 16 lbs. A/C Zero Leak dosage is 1 ounce per each lb of refrigerant. **Q: Is this a 4 oz or 2 oz product? Both figures are listed on the same product page.** A: My bottles contained 4 oz. Not sure if there is a smaller size available. **Q: It says compatible with poe systems. is this compatible with high voltage compressors in hybrids and electric cars?** A: A/C Zero Leak is compatible with POE oils and A/C systems in hybrids and EVs. **Q: How bad is too bad of a leak ,for it not to work,mine leaks out in about a day n a half** A: It will not work on that leak. ## Frequently Bought Together - ComStar A/C Zero-Leak, Permanent "Stop Leak" for A/C Systems, Seals Leaks Instantly, Non-Hardening, Polymer-Free, Eco-Friendly, Made in USA, 4 Ounces (90-700) - X AUTOHAUX Oil and Dye Injectors Kit 30ml/1 Oz Hand Push Compressor Manual AC Oil Dye Injector with Quick Coupler 1/4 SAE Connector Car HVAC Compressor Oil Dye Injector Refrigerant Tool --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/743128412-comstar-a-c-zero-leak-permanent-stop-leak-for-c](https://www.desertcart.co.uk/products/743128412-comstar-a-c-zero-leak-permanent-stop-leak-for-c) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-30*