---
product_id: 265517975
title: "SEM 39673 Black Self Etching Primer - 15.5 oz."
brand: "sem"
price: "HK$606"
currency: HKD
in_stock: true
reviews_count: 5
category: "Sem"
url: https://www.desertcart.hk/products/265517975-sem-39673-black-self-etching-primer-15-5-oz
store_origin: HK
region: Hong Kong
---

# Fast drying in ~1 hour Superior adhesion to bare metal Smooth, even fine spray SEM 39673 Black Self Etching Primer - 15.5 oz.

**Brand:** sem
**Price:** HK$606
**Availability:** ✅ In Stock

## Summary

> ⚡ Prime like a pro — fast, flawless, and fiercely reliable!

## Quick Answers

- **What is this?** SEM 39673 Black Self Etching Primer - 15.5 oz. by sem
- **How much does it cost?** HK$606 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/265517975-sem-39673-black-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

- • **Generous Coverage:** 15.5 oz can covers up to 15 sq ft—more paint, less hassle, better value.
- • **Rapid Drying Power:** Get your project moving fast with primer ready for topcoat in just about an hour.
- • **Unmatched Metal Grip:** Engineered to etch and bond flawlessly to bare aluminum and steel surfaces.
- • **Precision Spray Finish:** Fine mist application ensures an even, professional matte base coat every time.
- • **Trusted Industry Standard:** Ranked #2 in primers with 4.5-star reviews from over 500 pros and enthusiasts.

## Overview

The SEM 39673 Black Self Etching Primer is a high-performance automotive and industrial primer designed for superior adhesion to bare metal surfaces. Its fast-drying formula allows color coats after just one hour, while the fine spray delivers an even matte finish. Packaged in a larger 15.5 oz aerosol can, it offers excellent coverage and stain resistance, making it a top choice for professionals seeking efficiency and quality in their prep work.

## Description

Self Etching Primer is a first-step coating that provides excellent adhesion to bare substrates.

Review: Good service
Review: This primer is the easiest to use self etching primer I've found so far and it adheres as well or better than anything else I've used for painting bare aluminum. It has a fine spray that goes on far more evenly than most rattle can paints. The primer dries quickly (three thin coats five to ten minutes apart are recommended) and can have the color coats applied after only an hour or so. While the can doesn't specify any temperature range for applying the paint, I have used it in 65-80°F temperatures without any problems. Obviously, the paint will dry faster at higher temperatures. Lower is better since the primer has to be liquid to etch the surface. The can does not recommend applying color coats directly to this primer (SEM doesn't specifically say so but a conventional primer should be used over the self etching primer), which is consistent with other self etching primers I have used which recommend using a regular primer over the self etching primer before applying color coats. I found that Krylon's Dual, a combination of primer and color coat, will work well when applied directly to this self etching primer, which reduces the overall number of coats of paint needed (the Krylon dries very slowly, though, although coats can be applied around 30 minutes apart). As always, proper surface prep is needed. I wet sand the surface with 320 or 400 wet/dry (which one depends how smooth a surface I want), then, after rinsing the piece with hot water and letting it dry thoroughly, I wipe it down with an acetone saturated cloth to degrease the surface (denatured alcohol or lacquer thinner also work well). While degreasing the work and handling it afterword, I wear disposable nitrile gloves to protect my skin and keep skin oils off the surface of the work. The price may seem high compared to other rattle can paints but is actually competitive with other self etching primers when you consider this comes in 15.5 oz. cans instead of the usual 12 oz. cans.

## Features

- Item Category: Paint
- Item Trademark: SEM
- manufacturer: Generic

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000PKZ3IY |
| ASIN  | B000PKZ3IY |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #15,705 in Automotive ( See Top 100 in Automotive ) #2 in Primers |
| Color | Black |
| Coverage | 12-15 sq ft/15.5 oz |
| Customer Reviews | 4.5 4.5 out of 5 stars (512) |
| Customer reviews | 4.5 4.5 out of 5 stars (512) |
| Date First Available | 6 February 2013 |
| Date First Available  | 6 February 2013 |
| Finish | Matte |
| Included components | Aerosol |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 590 g |
| Item model number | 39673 |
| Item model number  | 39673 |
| Manufacturer | SEM |
| Manufacturer  | SEM |
| Part number | 39673 |
| Product Dimensions | 15.24 x 5.08 x 5.08 cm; 589.67 g |
| Product Dimensions  | 15.24 x 5.08 x 5.08 cm; 589.67 g |
| Size | 15.5 Ounce (Pack of 1) |
| Special Features | Stain Resistant |
| Specific uses | Automotive, Industrial |

## Product Details

- **Brand:** SEM
- **Colour:** Black
- **Finish type:** Matte
- **Item volume:** 65.66 Cubic Inches
- **Size:** 15.5 Ounce (Pack of 1)

## Images

![SEM 39673 Black Self Etching Primer - 15.5 oz. - Image 1](https://m.media-amazon.com/images/I/81wuMdZCoQL.jpg)

## Questions & Answers

**Q: Is this compatible with a urethane basecoat and clearcoat?**
A: Self etch primer is for bare metal. You should seal it first with a top coat of sealer primer before basecoat.  I have put basecoat directly on it with no problems though.

**Q: Will this stick to plastic ?**
A: I would probably use SEM Flexible Primer Surfacer on plastic.

**Q: Should this product be used on bumpers before spraying with SEM black trim paint?**
A: I'm not an expert but I use this product on bare "not chrome" metal. If you're talking about a chrome bumper I'm just not sure if this product would actually "etch" it.  That's an interesting question though.  I think you should call SEM or Eastwood products and ask. Eastwood has a lot of products and experience with coating different materials. Check their website out. I'm interested to hear what worked for you so please let me know.

**Q: why is the 2 pack more expensive than 2 single cans combined?**
A: I bought 2 and 4 packs cheaper 
Just have to search

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***Y on 1 May 2025*

Good service

### ⭐⭐⭐⭐⭐ Review
*by J***E on 10 July 2016*

This primer is the easiest to use self etching primer I've found so far and it adheres as well or better than anything else I've used for painting bare aluminum. It has a fine spray that goes on far more evenly than most rattle can paints. The primer dries quickly (three thin coats five to ten minutes apart are recommended) and can have the color coats applied after only an hour or so. While the can doesn't specify any temperature range for applying the paint, I have used it in 65-80°F temperatures without any problems. Obviously, the paint will dry faster at higher temperatures. Lower is better since the primer has to be liquid to etch the surface. The can does not recommend applying color coats directly to this primer (SEM doesn't specifically say so but a conventional primer should be used over the self etching primer), which is consistent with other self etching primers I have used which recommend using a regular primer over the self etching primer before applying color coats. I found that Krylon's Dual, a combination of primer and color coat, will work well when applied directly to this self etching primer, which reduces the overall number of coats of paint needed (the Krylon dries very slowly, though, although coats can be applied around 30 minutes apart). As always, proper surface prep is needed. I wet sand the surface with 320 or 400 wet/dry (which one depends how smooth a surface I want), then, after rinsing the piece with hot water and letting it dry thoroughly, I wipe it down with an acetone saturated cloth to degrease the surface (denatured alcohol or lacquer thinner also work well). While degreasing the work and handling it afterword, I wear disposable nitrile gloves to protect my skin and keep skin oils off the surface of the work. The price may seem high compared to other rattle can paints but is actually competitive with other self etching primers when you consider this comes in 15.5 oz. cans instead of the usual 12 oz. cans.

### ⭐⭐⭐ Review
*by M***S on 15 October 2024*

Covers well seems durable but the price is ridiculous that's why I gave it 3 stars.

## Frequently Bought Together

- SEM 39673 Black Self Etching Primer - 15.5 oz.
- SEM 39683 Grey Self Etching Primer - 15.5 oz.
- SEM 42003 Black High Build Primer - 16 oz.

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-05*