---
product_id: 265517976
title: "SEM 39683 Grey Self Etching Primer - 15.5 oz."
brand: "sem"
price: "R1311"
currency: ZAR
in_stock: true
url: https://www.desertcart.co.za/products/265517976-sem-39683-grey-self-etching-primer-15-5-oz
store_origin: ZA
region: South Africa
---

# Matte Grey Finish Fast-Drying Formula Superior Metal Adhesion SEM 39683 Grey Self Etching Primer - 15.5 oz.

**Brand:** sem
**Price:** R1311
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your metalwork with the primer pros trust — fast, flawless, and fiercely reliable!

## Quick Answers

- **What is this?** SEM 39683 Grey Self Etching Primer - 15.5 oz. by sem
- **How much does it cost?** R1311 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/265517976-sem-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

- • **Optimal Coverage:** Covers up to 5.6 sq.m per liter, maximizing your project’s efficiency and minimizing waste.
- • **Speed Meets Efficiency:** Fast-drying aerosol spray designed to accelerate your refinishing projects without compromising quality.
- • **Precision Metal Bonding:** Self-etching primer that locks onto steel, aluminum, and stainless steel for unmatched durability.
- • **Versatile Compatibility:** Seamlessly works under primer surfacers and most paint systems for flawless layering.
- • **Professional-Grade Finish:** Matte grey finish that provides a sleek, smooth base for automotive and industrial coatings.

## Overview

The SEM 39683 Grey Self Etching Primer is a 15.5 oz aerosol designed for superior adhesion on steel, aluminum, and stainless steel surfaces. Fast-drying and compatible with most paint systems, it offers a matte grey finish ideal for automotive refinishing, metal restoration, and industrial applications. With coverage up to 5.6 sq.m per liter, it ensures efficient, professional-grade results every time.

## Description

SEM 39683 Grey Self Etching Primer - 15.5 oz.

## Features

- manufacturer: SEM
- Item Trademark: SEM
- Item Weight: pounds, pounds, 1.30, 1.30
- Item Category: Paint

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | SEM |
| Part number | 39683 |
| Item Weight | 454 g |
| Product Dimensions | 6.99 x 6.99 x 23.5 cm; 453.59 g |
| Item model number | 39683 |
| Size | 15.5 Ounce (Pack of 1) |
| Color | Grey |
| Finish | Matte |
| Item thickness | 9.25 Inches |
| Item Package Quantity | 1 |
| Coverage | 4.7-5.6 sq.m/liter |
| Special Features | Fast-Drying, Excellent Adhesion |
| Specific uses | automotive repair and refinishing, metal restoration projects, industrial coating applications |
| Included components | Aerosol Can |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** SEM
- **Colour:** Grey
- **Finish type:** Matte
- **Size:** 15.5 Ounce (Pack of 1)
- **Special features:** Fast-Drying, Excellent Adhesion

## Images

![SEM 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.za/products/265517976-sem-39683-grey-self-etching-primer-15-5-oz](https://www.desertcart.co.za/products/265517976-sem-39683-grey-self-etching-primer-15-5-oz)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-21*