--- product_id: 7622563 title: "K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz" brand: "crc" price: "AR$91295" currency: ARS in_stock: true category: "Crc" url: https://www.desertcart.com.ar/products/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator store_origin: AR region: Argentina --- # Withstands extreme pressure & temperature Universal for all water-cooled engines Permanent molecular steel-strong bond K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz **Brand:** crc **Price:** AR$91295 **Availability:** ✅ In Stock ## Summary > 🛡️ Seal it once, drive forever – the ultimate fix for fearless road warriors! ## Quick Answers - **What is this?** K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz by crc - **How much does it cost?** AR$91295 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator) ## Best For - crc enthusiasts ## Why This Product - Trusted crc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Steel-Strong Seal:** Creates a permanent molecular bond as tough as steel for unmatched durability. - • **No Wash Away Guarantee:** Stays intact under all driving conditions, preventing costly breakdowns and downtime. - • **Extreme Condition Ready:** Engineered to endure the highest pressures and temperatures in any cooling system. - • **Universal Compatibility:** Seals cracks and leaks in cast iron, aluminum, copper, and bi-material cooling components. - • **Professional Grade Formula:** Exceeds ASTM D6107 standards, trusted by mechanics and pros alike. ## Overview K&W 401016 Block Seal Permanent Metallic™ is a professional-grade, 16 oz sealant that forms a molecular bond as strong as steel. It effectively seals cracks and leaks in engine blocks, head gaskets, freeze plugs, and radiators made from cast iron, aluminum, copper, and bi-materials. Designed for all water-cooled diesel and gasoline vehicles, it withstands extreme pressure and temperature without washing away, exceeding ASTM D6107 standards for reliable, long-lasting cooling system protection. ## Description Forms a permanent molecular bond that's as strong as steel. Seals cracks & holes in cast iron & aluminum engine blocks, head gaskets, freeze plugs, & copper, aluminum & bi-material radiators & heater cores. Tested by an Independent test lab. Rated No.1 ## Features - Permanent molecular seal that’s as strong as steel - Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores - For use in all water-cooled diesel and gasoline vehicles - Withstands extreme pressure and temperatures of a cooling system and will not wash away - Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000CIPV5E | | Best Sellers Rank | #143,700 in Automotive ( See Top 100 in Automotive ) #10 in Radiator Sealers #3,282 in Oils & Fluids | | Brand | CRC | | Customer Reviews | 4.0 4.0 out of 5 stars (414) | | Date First Available | July 7, 2004 | | Exterior | Machined | | Item Weight | 1.15 pounds | | Item model number | 401016 | | Manufacturer | CRC | | Manufacturer Part Number | 401016 | | Model | 401016 | | Product Dimensions | 5.87 x 2.31 x 2.13 inches | ## Images ![K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz - Image 1](https://m.media-amazon.com/images/I/71NmJvpOdPL.jpg) ## Available Options This product comes in different **Number Of Items** options. ## Questions & Answers **Q: How is this one different from another orange can with the same product title, also sold at Amazon?** A: If you provide a link I would be happy to see if there is a difference. I do not find a single can listed with this same title. I see a 6 pack. **Q: how about if you can’t take off thermostat.. cause my truck Thermostat come with it 2005 Dodge ram 1500** A: I didn’t take off my thermostat. All I did was drain the existing coolant, fill it up with tap water half way then add the CRC bottle and then top off the water. Drive it around for a week or two (500 miles). Check the radiator daily before you head out and if it does down fill it up with water. After a week of driving you will notice that the water in the radiator will stop leaking (if it works). Once it stops leaking for a couple of days then you can drain it again, flush it out with water then add in your coolant again. **Q: can we pour it into the overflow reservoir?** A: If I remember it's a big no on that. Take off the top hose of radiator and pour it in the hose. But you want to have room for it to flow into radiator. I think it was kinda thick so mix it with hot water then add to hose. That's my two cents. **Q: will it stop water to oil leak?** A: I don’t think so....think of it this way, the coolant has to leak into the combustion chamber for it to work. The high heat will fuse the particle together at the crack and eventually plug up the leak. You would have to leave it in your coolant for approx 500 miles. That will give it time for this mixture to travel into your cylinder, heat up and plug up the leak. Actually for me it only took about 200 miles and I noticed the water in the radiator stopped leaking (I check it every morning before driving out). ## Frequently Bought Together - CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz - BlueDevil Products 00203 Radiator Flush & Oil Degreaser - 1 Quart - K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology - 32 Fl Oz --- ## 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.com.ar/products/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator](https://www.desertcart.com.ar/products/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-09-27*