--- product_id: 11775581 title: "39683 Grey Self Etching Primer - 15.5 oz." brand: "sem" price: "£32.38" currency: GBP in_stock: true category: "Sem" url: https://www.desertcart.co.uk/products/11775581-39683-grey-self-etching-primer-15-5-oz store_origin: GB region: United Kingdom --- # Fast 1-hour full cure Excellent adhesion to bare metal Superior corrosion resistance 39683 Grey Self Etching Primer - 15.5 oz. **Brand:** sem **Price:** £32.38 **Availability:** ✅ In Stock ## Summary > 🖌️ Prime like a pro — flawless adhesion, fast drying, zero compromises! ## Quick Answers - **What is this?** 39683 Grey Self Etching Primer - 15.5 oz. by sem - **How much does it cost?** £32.38 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/11775581-39683-grey-self-etching-primer-15-5-oz) ## 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 - • **Rapid Dry & Cure:** Get your project moving with a full cure in just 1 hour ⚡ - • **Corrosion Defense:** Protect your metal surfaces with industry-leading rust resistance 🛡️ - • **Pro-Level Coverage:** 15.5 oz can delivers smooth, consistent primer for flawless finishes - • **Versatile Application:** Perfect for automotive, industrial, and metal restoration projects - • **Unmatched Metal Bonding:** Self-etching formula ensures flawless adhesion every time 🎯 ## Overview SEM 39683 Grey Self Etching Primer is a fast-drying, high-adhesion primer designed for bare metal surfaces. With a 1-hour full cure time and excellent corrosion resistance, this 15.5 oz can offers professional-grade coverage ideal for automotive repair, metal restoration, and industrial coatings. Trusted by pros and DIYers alike for consistent, durable results. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000GTIRAU | | Age Range Description | Adult | | Best Sellers Rank | #13,482 in Automotive ( See Top 100 in Automotive ) #10 in Automotive Primers | | Brand | SEM | | Brand Name | SEM | | Color | Grey | | Color Code | #808080 | | Container Type | Can | | Coverage | Excellent | | Customer Reviews | 4.6 out of 5 stars 563 Reviews | | Dry Time In Hours | 3 | | Finish Type | Primer | | Full Cure Time | 1 Hours | | Global Trade Identification Number | 00646786396830 | | Included Components | Item | | Indoor Outdoor Usage | Outdoor | | Is Waterproof | False | | Item Form | Liquid | | Item Volume | 65.66 Cubic Inches | | Item Weight | 1 Pounds | | Manufacturer | SEM | | Model Name | 39683 | | Model Number | 39683 | | Paint Type | Etching Primer | | Part Number | 39683 | | Size | 15.5 Ounce (Pack of 1) | | Special Feature | Fast-Drying, Excellent Adhesion | | Special Features | Fast-Drying, Excellent Adhesion | | Specific Uses For Product | automotive repair and refinishing, metal restoration projects, industrial coating applications | | Surface Recommendation | Variety | | UPC | 646786396830 | | Unit Count | 15.5 Ounce | | Warranty Description | Call vendor for warranty | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** SEM - **Color:** Grey - **Finish Type:** Primer - **Item Volume:** 65.66 Cubic Inches - **Paint Type:** Etching Primer - **Size:** 15.5 Ounce (Pack of 1) - **Special Feature:** Fast-Drying, Excellent Adhesion - **Specific Uses For Product:** automotive repair and refinishing, metal restoration projects, industrial coating applications - **Surface Recommendation:** Variety - **Unit Count:** 15.5 Ounce ## Images ![39683 Grey Self Etching Primer - 15.5 oz. - Image 1](https://m.media-amazon.com/images/I/81s4Jypno6L.jpg) ## Questions & Answers **Q: Why does SEM not recommend applying color directly to this primer?** A: This is an etching primer. I, used it on Magnesium after etching with Borax and baking soda mixed. After drying I, used this prime 4 light coats over 4 days 1200 wet sand paper. I, then coated with primer for the paint ! 3 coats wet sad 3 coats of final coat rubbed out with fine polishing compound.I, did this project in Nov 19. So far so good. **Q: What type of paint can be applied on top of the primer? any paint? sprays? water based? oil based? are there any restrictions?** A: I would recommend staying with the same brand of paint for both primer and top coat. Although the SEM primer seems to work well with most top coats, I had a bad experience using it with a Rustoleum top coat. After priming bare aluminum with the SEM self-etch and letting it cure overnight, I applied a Rustoleum top coat. Within a few hours both the primer and the top coat pealed off. I spoke with the the SEM and the Rustoleum technical folks but neither knew exactly what caused this. Both, however, recommended sticking with the same brand for primer and top coat. I would recommend doing some test sprays, letting the primer cure the recommended length of time before applying the top coat. Note that the SEM self-etch is acetone based, and this might cause a problem with topcoats that use other bases, especially if the SEM has not been cured long enough. **Q: I have stripped aluminum bare. self etching primer, then primer, then top coat? are all these these paints made by sem?** A: All i can tel u that the image is sem **Q: Is this the same as zinc chromate primer?** A: I do not have the can anymore. So I cannot read the ingredients. However I do not think it contains zinc chromate...which is used for marine and auto applications. This stuff works great for bonding to bare aluminum parts that will need to be painted. Hope this helps. ## Frequently Bought Together - SEM 39683 Grey Self Etching Primer - 15.5 oz. - J-B Weld WaterWeld, 1 Hour Cure, Epoxy Putty Stick - 2 Pack, Off-White (8277-2) - Pond Armor SKU-SKYBLUE-QT-R Non-Toxic Pond Shield Epoxy Paint, 1.5-Quart, Sky Blue, 48 Fl Oz (Pack of 1) --- ## 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/11775581-39683-grey-self-etching-primer-15-5-oz](https://www.desertcart.co.uk/products/11775581-39683-grey-self-etching-primer-15-5-oz) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-26*