--- product_id: 103791360 title: "40773 zinc Based Weld Thru Primer" brand: "sem" price: "R1278" currency: ZAR in_stock: true reviews_count: 8 category: "Sem" url: https://www.desertcart.co.za/products/103791360-40773-zinc-based-weld-thru-primer store_origin: ZA region: South Africa --- # Low weld spatter formula Enhanced metal adhesion Zinc-based corrosion shield 40773 zinc Based Weld Thru Primer **Brand:** sem **Price:** R1278 **Availability:** ✅ In Stock ## Summary > 🛠️ Weld Strong, Rust Never: The Primer Pros Trust ## Quick Answers - **What is this?** 40773 zinc Based Weld Thru Primer by sem - **How much does it cost?** R1278 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/103791360-40773-zinc-based-weld-thru-primer) ## Best For - sem enthusiasts ## Why This Product - Trusted sem brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Metal Bond Mastery:** Superior adhesion to bare metal ensures long-lasting protection without flaking or peeling. - • **OEM Trusted Quality:** Recommended by top manufacturers, guaranteeing reliability and peace of mind on every project. - • **Ultimate Rust Defense:** Zinc-rich formula delivers industry-leading corrosion protection that outlasts the competition. - • **Spray & Protect Efficiency:** Smooth aerosol application covers evenly for quick, hassle-free corrosion defense. - • **Seamless Weld Compatibility:** Minimizes heat-affected zones and weld spatter for flawless, professional-grade welds every time. ## Overview The 40773 Zinc Based Weld Thru Primer by SEM is a 12.8 oz aerosol primer designed for superior corrosion protection during welding. Its zinc-rich formula enhances adhesion to bare metal, minimizes weld spatter, and withstands cavity wax without flaking. OEM recommended and compatible with MIG and STRSW welding, it ensures durable, professional results with a matte finish and full cure in 24 hours. ## Description ZincWeld Weld-Through Primer Aerosol 12.8 oz Zinc-based formula for best-in-class corrosion protection. Enhanced adhesion to bare metal for added corrosion protection. No flaking or peeling . not affected by cavity wax. Minimizes the heat affected zone while welding. Low weld spatter formula. Smooth spraying and easy covering. Compatible with MIG and STRSW welding 40773 Review: Great product - Worked well for me. Review: Works great - I use the weld through primer when I gave body sheet metal that will be welded together with plug welds. It's just extra insurance against rust through of the new panels in years to come. Though I no longer work professionally, when I did, SEM products never let me down. Price wise, it's sort of middle of the road, but I don't trust using the less expensive brands that contain a smaller percentage of the rust proofing ingredients and have less electrical conductivity which makes getting a good weld more difficult. ## Features - Weld thru primer - Zinc-based formula for best-in-class corrosion protection - Enhanced adhesion to bare metal for added corrosion protection - OEM recommended ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07KPN6PNT | | Age Range Description | Adult | | Best Sellers Rank | #128,893 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #65 in Automotive Primers #104 in Primer Paint | | Brand Name | SEM | | Color | gray | | Color Code | #808080 | | Container Type | Can | | Coverage | Corrosion protection between welded substrates | | Customer Reviews | 4.6 4.6 out of 5 stars (121) | | Dry Time In Hours | 24 | | Finish Type | Matte | | Full Cure Time | 24 Hours | | Global Trade Identification Number | 04064678640773 | | Included Components | Spray | | Indoor Outdoor Usage | Outdoor | | Is Waterproof | False | | Item Form | Aerosol | | Item Volume | 44.93 Cubic Inches | | Item Weight | 1 Pounds | | Manufacturer | SEM Products | | Model Number | SEM-40773 | | Paint Type | Primer | | Part Number | 40773 | | Size | 12.8 Ounce (Pack of 1) | | Special Features | Corrosion Resistant, Low Spatter | | Specific Uses For Product | Interior/Exterior | | Surface Recommendation | Metal | | UPC | 646786407734 | | Unit Count | 12.8 Ounce | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** SEM - **Color:** gray - **Finish Type:** Matte - **Item Volume:** 44.93 Cubic Inches - **Paint Type:** Primer - **Size:** 12.8 Ounce (Pack of 1) - **Special Feature:** Corrosion Resistant, Low Spatter - **Specific Uses For Product:** Interior/Exterior - **Surface Recommendation:** Metal - **Unit Count:** 12.8 Ounce ## Images ![40773 zinc Based Weld Thru Primer - Image 1](https://m.media-amazon.com/images/I/617m0hjps7L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product *by A***N on May 16, 2025* Worked well for me. ### ⭐⭐⭐⭐⭐ Works great *by R***V on July 27, 2024* I use the weld through primer when I gave body sheet metal that will be welded together with plug welds. It's just extra insurance against rust through of the new panels in years to come. Though I no longer work professionally, when I did, SEM products never let me down. Price wise, it's sort of middle of the road, but I don't trust using the less expensive brands that contain a smaller percentage of the rust proofing ingredients and have less electrical conductivity which makes getting a good weld more difficult. ### ⭐⭐⭐⭐⭐ It works *by M***S on February 24, 2025* Works great --- ## 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.za/products/103791360-40773-zinc-based-weld-thru-primer](https://www.desertcart.co.za/products/103791360-40773-zinc-based-weld-thru-primer) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-06-20*