---
product_id: 11775534
title: "39673 Black Self Etching Primer - 15.5 oz."
brand: "sem"
price: "$1570"
currency: MXN
in_stock: true
reviews_count: 11
category: "Sem"
url: https://www.desertcart.mx/products/11775534-39673-black-self-etching-primer-15-5-oz
store_origin: MX
region: Mexico
---

# Fast drying in 30 mins Superior adhesion to bare metal Fine, even spray application 39673 Black Self Etching Primer - 15.5 oz.

**Brand:** sem
**Price:** $1570
**Availability:** ✅ In Stock

## Summary

> ⚡ Prime like a pro, finish like a boss!

## Quick Answers

- **What is this?** 39673 Black Self Etching Primer - 15.5 oz. by sem
- **How much does it cost?** $1570 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/11775534-39673-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

- • **Rapid Drying Power:** Dries in just 30 minutes, keeping your project moving at lightning speed.
- • **Smooth, Even Coverage:** Fine spray delivers a flawless satin finish with minimal effort.
- • **Unmatched Metal Bonding:** Self-etching formula ensures rock-solid adhesion on bare aluminum and steel.
- • **Generous Volume Advantage:** 15.5 oz can offers 25% more product than typical primers—more coverage, less hassle.
- • **Trusted Professional Choice:** Ranked #42 in Automotive Primers with a 4.6-star rating from 533 users.

## Overview

SEM 39673 Black Self Etching Primer is a high-performance, oil-based primer designed for superior adhesion on bare metal surfaces like aluminum. Its fast-drying formula allows color coats after just 30 minutes, while the fine spray ensures even, satin coverage. Packaged in a larger 15.5 oz aerosol can, it offers excellent value and is highly rated by automotive professionals for touch-ups and industrial use.

## Description

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

Review: Finally, a good, easy to apply, self etching primer! - 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: Awesome product - I use this as my go to for touching up frames and suspension components under the car before and after winter. Leaves a nice factory looking satin finish and is a thin coating for going right over bolt heads without issue later on

## Features

- New

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000PKZ3IY |
| Best Sellers Rank | #79,756 in Automotive ( See Top 100 in Automotive ) #42 in Automotive Primers |
| Brand | SEM |
| Color | Black |
| Color Code | #000000 |
| Coverage | 40-50 square feet |
| Customer Reviews | 4.6 4.6 out of 5 stars (533) |
| Date First Available | April 20, 2007 |
| Dry Time In Hours | 0.5 |
| Exterior | Aluminum |
| Finish Type | Primer |
| Global Trade Identification Number | 00646786396731 |
| Included Components | Aerosol |
| Indoor/Outdoor Usage | Outdoor |
| Is Discontinued By Manufacturer | No |
| Is Waterproof | False |
| Item Form | Liquid |
| Item Volume | 65.66 Cubic Inches |
| Item Weight | 1.1 pounds |
| Item model number | 39673 |
| Manufacturer | SEM |
| Manufacturer Part Number | 39673 |
| Model Name | 39673 |
| Package Information | Can |
| Paint Type | Oil |
| Product Dimensions | 6 x 2 x 2 inches |
| Size | 15.5 Ounce (Pack of 1) |
| Special Feature | Stain Resistant |
| Special Features | Stain Resistant |
| Specific Uses For Product | Automotive, Industrial |
| Surface Recommendation | Metal |
| UPC | 646786396731 |
| Unit Count | 15.5 Ounce |
| Water Resistance Level | Water Repellent |

## Product Details

- **Brand:** SEM
- **Color:** Black
- **Finish Type:** Primer
- **Item Volume:** 65.66 Cubic Inches
- **Paint Type:** Oil
- **Size:** 15.5 Ounce (Pack of 1)
- **Special Feature:** Stain Resistant
- **Specific Uses For Product:** Automotive, Industrial
- **Surface Recommendation:** Metal
- **Unit Count:** 15.5 Ounce

## Images

![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

### ⭐⭐⭐⭐⭐ Finally, a good, easy to apply, self etching primer!
*by J***E on July 10, 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.

### ⭐⭐⭐⭐⭐ Awesome product
*by R***T on November 5, 2024*

I use this as my go to for touching up frames and suspension components under the car before and after winter. Leaves a nice factory looking satin finish and is a thin coating for going right over bolt heads without issue later on

### ⭐⭐⭐⭐⭐ A close paint match
*by M***D on December 4, 2025*

A close match to OEM paint on older Kawasaki master cylinders.

## 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 Mexico*
*Store origin: MX*
*Last updated: 2026-02-22*