--- product_id: 19831200 title: "Mastercool 90935 Alum Bond Aluminum Repair Compound – High-Strength Aluminum-Filled Epoxy for Castings, Radiators, Tanks & Engine Components – Machinable Metal Repair Solution" brand: "mastercool" price: "$43.80" currency: USD in_stock: true reviews_count: 8 url: https://www.desertcart.us/products/19831200-mastercool-90935-alum-bond-aluminum-repair-compound-high-strength-aluminum store_origin: US region: United States of America --- # controlled working time resists up to 250°F 8600 PSI compressive strength Mastercool 90935 Alum Bond Aluminum Repair Compound – High-Strength Aluminum-Filled Epoxy for Castings, Radiators, Tanks & Engine Components – Machinable Metal Repair Solution **Brand:** mastercool **Price:** $43.80 **Availability:** ✅ In Stock ## Summary > 🔩 Fix it once, fix it like a pro—Mastercool Alum Bond seals the deal! ## Quick Answers - **What is this?** Mastercool 90935 Alum Bond Aluminum Repair Compound – High-Strength Aluminum-Filled Epoxy for Castings, Radiators, Tanks & Engine Components – Machinable Metal Repair Solution by mastercool - **How much does it cost?** $43.80 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/19831200-mastercool-90935-alum-bond-aluminum-repair-compound-high-strength-aluminum) ## Best For - mastercool enthusiasts ## Why This Product - Trusted mastercool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Machinability:** Drill, sand, or tap after curing—restore parts without costly replacements. - • **Industrial-Grade Strength:** Withstands 8,600 PSI compressive and 3,500 PSI tensile forces for repairs that last. - • **Vertical & Overhead Ready:** Non-sag formula stays put on any surface, no drip, no mess. - • **Heat-Resistant Reliability:** Performs flawlessly up to 250°F, perfect for automotive and HVAC demands. - • **Trusted Professional Quality:** Mastercool’s proven formula trusted by technicians nationwide. ## Overview Mastercool 90935 Alum Bond is a high-strength, aluminum-filled epoxy designed for permanent repairs on aluminum castings, radiators, engine blocks, and HVAC components. Offering 8,600 PSI compressive strength and machinability after curing, it ensures durable, precise fixes that withstand temperatures up to 250°F. Its non-sag formula enables clean vertical applications, making it a go-to solution for professional technicians seeking reliable, long-lasting metal repairs. ## Features - ✔ ALUMINUM-FILLED METAL REPAIR COMPOUND – Professional-grade aluminum-filled polymer designed to permanently repair cracks, blow holes, and casting imperfections in aluminum components including radiators, engine blocks, housings, tanks, and HVAC parts. - ✔ HIGH-STRENGTH INDUSTRIAL PERFORMANCE – Engineered for demanding repairs with approximately 8,600 PSI compressive strength and 3,500 PSI tensile strength, creating a durable repair capable of restoring damaged aluminum surfaces. - ✔ MACHINABLE AFTER CURING – Once fully cured, the repair compound can be drilled, sanded, tapped, or machined using standard metalworking tools, allowing technicians to restore functionality without replacing expensive components. - ✔ NON-SAG FORMULA FOR VERTICAL APPLICATIONS – Thick paste consistency allows Alum Bond to stay in place during application, making it ideal for filling cavities, blow holes, porosity, and irregular surfaces on vertical or overhead repairs. - ✔ HIGH TEMPERATURE RESISTANCE – Designed for automotive, HVAC, and industrial environments with temperature resistance up to 250°F (121°C) after full cure. - ✔ CONTROLLED WORKING TIME FOR PRECISE REPAIRS – Provides a practical working window depending on temperature conditions, allowing technicians time to properly apply and shape repairs before curing. - ✔ IDEAL FOR CASTING DEFECT AND SURFACE REPAIRS – Specifically designed for repairing aluminum castings, radiators, tanks, valves, pumps, engine blocks, and HVAC components where surface defects or porosity require permanent repair. - ✔ TRUSTED MASTERCOOL PROFESSIONAL QUALITY – Mastercool products are designed for professional technicians and supported by a trusted U.S.-based company known for reliable automotive and HVAC service tools. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00CDDA1OW | | Best Sellers Rank | #7,640 in Automotive (See Top 100 in Automotive) #21 in Air Conditioning Line Repair Tools | | Brand | Mastercool | | Customer Reviews | 4.4 4.4 out of 5 stars (81) 4.4 out of 5 stars | | Date First Available | April 16, 2013 | | Item Model Number | 90935 | | Item Weight | 7.2 ounces | | Manufacturer | Mastercool | | Manufacturer Part Number | 90935 | | Model | 90935 | | Oem Part Number | 90935 | | Product Dimensions | 6 x 3 x 2 inches | | Special Features | High Concentration of Aluminum Particles, Maximum Strength, Durability, and Ease of Application | ## Images ![Mastercool 90935 Alum Bond Aluminum Repair Compound – High-Strength Aluminum-Filled Epoxy for Castings, Radiators, Tanks & Engine Components – Machinable Metal Repair Solution - Image 1](https://m.media-amazon.com/images/I/71m4+SPy3VL.jpg) ## Questions & Answers **Q: Would this work on a evaporator? Need to seal a small leak** A: Yes it would . However, if your evaporator is leaking in one spot due to old age and corrosion, the rest is not far behind. Replace it. If you punctured the core and its in good shape then by all means. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Quality product *by on Reviewed in the United States July 1, 2026* This is a good product, I tested it against JB Weld and it adhered better and was stronger. I would expect that, since it is designed to seal high pressure refrigerant leaks, I was not disappointed. I used it to fill gaps, holes, and other flaws in my aluminum boat instead of having everything heli-arced, worked well. ### ⭐⭐⭐⭐⭐ MUST HAVE IN YOUR HVAC TOOL KIT!! *by on Reviewed in the United States August 6, 2026* This stuff worked GREAT!!! I had a leak in my minisplit condenser coil and this patched the hole. I let it set over night then pressurize the coil to 317 psi and it held for over an hour, passed my test. ### ⭐⭐⭐⭐⭐ Better than expected! *by on Reviewed in the United States May 26, 2026* This stuff is absolutely amazing! Wicked strong ! The had bought a 300 dollar aluminum boat and had tons of holes and cracks and I used up the entire kit to repair the boat ! I followed the instructions completely and am more the satisfied and confident that this boat won’t leak again ! Excellent product! ## Frequently Bought Together - MASTERCOOL 90935 A/C Repair Epoxy - J-B Weld 8267 SteelStik Steel Reinforced Epoxy Putty Stick - 2 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.us/products/19831200-mastercool-90935-alum-bond-aluminum-repair-compound-high-strength-aluminum](https://www.desertcart.us/products/19831200-mastercool-90935-alum-bond-aluminum-repair-compound-high-strength-aluminum) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-29*