---
product_id: 47209036
title: "3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz, 1 Bottle, Designed for Difficult-to-Bond, Low Surface Energy Rubbers"
brand: "3m"
price: "AR$100904"
currency: ARS
in_stock: true
reviews_count: 8
category: "3 M"
url: https://www.desertcart.com.ar/products/47209036-3m-scotch-weld-instant-adhesive-primer-ac79-clear-2-fl
store_origin: AR
region: Argentina
---

# Fast drying primer Boosts adhesion on tough rubbers Contains cure accelerator 3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz, 1 Bottle, Designed for Difficult-to-Bond, Low Surface Energy Rubbers

**Brand:** 3m
**Price:** AR$100904
**Availability:** ✅ In Stock

## Summary

> 🔗 Stick with the best — bond smarter, not harder!

## Quick Answers

- **What is this?** 3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz, 1 Bottle, Designed for Difficult-to-Bond, Low Surface Energy Rubbers by 3m
- **How much does it cost?** AR$100904 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/47209036-3m-scotch-weld-instant-adhesive-primer-ac79-clear-2-fl)

## Best For

- 3m enthusiasts

## Why This Product

- Trusted 3m brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Bond Like a Pro:** Enhances adhesion on low surface energy rubbers like silicone & EPDM 🔗
- • **Eco-Conscious Choice:** California compliant formula for safer, responsible use
- • **Precision Application:** Ultra-thin primer wicks into gaps for flawless bonding 🧪
- • **Speed Up Your Workflow:** Fast-drying formula keeps projects moving without delay ⚡
- • **Industrial Strength Reliability:** Trusted by professionals for demanding repairs and assemblies

## Overview

3M Scotch-Weld Instant Adhesive Primer AC79 is a clear, fast-drying primer designed to dramatically improve adhesion on difficult-to-bond, low surface energy elastomers such as silicone, EPDM, and fluoroelastomers. Its ultra-thin formula contains a cure accelerator to ensure strong, reliable bonds, making it a must-have for professional-grade repairs and industrial applications. California compliant and easy to apply, this 2 fl oz bottle delivers precision bonding performance trusted worldwide.

## Description

3M™ Scotch-Weld™ Instant Adhesive Primer AC79 is designed for use on difficult-to-bond low surface energy elastomers, such as EPDM, silicone and other rubbers. Surface preparation and application are straightforward and the adhesive primer is fast drying to keep jobs moving quickly. Designed for Difficult-to-Bond, Low Surface Energy Rubbers 3M Scotch-Weld Instant Adhesive Primer AC79 is designed for difficult-to-bond, low surface energy elastomers. This primer should be applied to each low surface energy substrate surface to achieve desired results. Recommended Applications Improves adhesion of cyanoacrylate adhesives to: Difficult-to-bond flexible elastomers EPDM Silicone Fluoroelastomers Understanding Instant Adhesives Instant adhesives are cyanoacrylate based formulas that are strong, fast-acting glues used in industrial and household applications. In general, they are an acrylic resin that rapidly polymerizes in the presence of moisture, forming long, strong chains, joining the bonded surfaces together. Cyanoacrylate adhesives should be applied thinly, with pressure put on the bond for a few seconds, to ensure that the reaction proceeds rapidly and a strong bond is formed within a reasonable time. 3M instant adhesives apply right from the container and rapidly reach handling strength at room temperature. Commonly referred to as a super hold glue, a single drop per square inch can bond many plastics, rubbers, metals, wood and more. An instant adhesive from 3M set a Guinness World Record in 2012 for the strongest glue by lifting an 8.1 metric ton forklift in the air for one hour. Bringing Better Ideas to the Surface through Science and Innovation In our 3M Industrial Adhesives and Tapes Division, we apply the science of adhesion to deliver innovative solutions that improve the design and manufacturing processes of companies around the world. In the end, our technologies help customers like you deliver competitive products to the market faster and more efficiently.

Review: Holy smokes! Works like nothing I have ever used before! - I repair things as a career. Like huge industrial stuff,1000ft long lake freighters, steel mills etc. I have access to so many expensive industrial chemicals and adhesives. None I had found were up to the task on a home project I was doing in my shop. I needed to bond a rubber boot to a part made from POM (Acetal) Both are difficult to adhere to. Nothing sticks to POM and anything strong does not flex with the rubber. LOTS of inter-web research and LOTS of claims and hype. I found that both materials were on an extensive list 3M had of materials P40 is comparable with. They were NOT kidding! It worked even without the primer! Like my first try I mis-located the boot a bit..... Too late! It is still stuck right where I put it. This stuff is ultra thin! Some part in the description says gel. NO! BUT! the way this stuff wicks into the gaps and stuff makes this all the better for me. I assemble the parts exactly where I want, a single drop at the joint......and it's capillary action pulls this stuff right where it needs to be! I've used it on a few more things playing around. THIS STUFF WORKS! HIGHLY RECOMMEND! The primer is a must have IMO. It gives the best chance at a successful bond, especially for difficult plastics. YOU PRETTY MUCH GET 1 SHOT AT IT! Ray the Maker
Review: Really Sticks - I am gluing silicon rubber to a stainless steel washer; a very difficult task. I first used just Scotch Weld PR40, plastic and rubber adhesive. I abraded the washer and rubber with 150 grit sandpaper. After 24 hours the rubber peeled off fairly easily. I repeated the experiment but used the Scotch Weld AC70 brushed on the abraded rubber. After 24 hours the rubber stuck very well even while pulling with considerable force! The primer and abrading are essential!

## Features

- Improves adhesion on flexible elastomers, including rubbers, such as silicone, fluoroelastomers, EPDM and TPE
- Fast drying to keep jobs moving quickly
- Contains cure accelerator
- Straightforward surface preparation and easy application
- California compliant

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B071W9H889 |
| Best Sellers Rank | #68,386 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #21 in Adhesive Primers |
| Brand | 3M |
| Brand Name | 3M |
| Color | Clear |
| Compatible Material | Rubber |
| Container Type | Bottle |
| Customer Reviews | 4.2 out of 5 stars 114 Reviews |
| Global Trade Identification Number | 00051115313882 |
| Included Components | Adhesive Primer |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Manufacturer | 3M |
| Material | Silicone |
| Material Type | Silicone |
| Model | AC79 |
| Other Special Features of the Product | Improves Adhesion on Flexible Elastomers, Contains Cure Accelerator |
| Special Feature | Improves Adhesion on Flexible Elastomers, Contains Cure Accelerator |
| Specific Uses For Product | Repair |
| UPC | 051115313882 |
| Unit Count | 2.0 Fluid Ounces |
| Viscosity | Low to Medium |
| Volume | 2 Fluid Ounces |
| Water Resistance Level | Not Water Resistant |

## Product Details

- **Brand:** 3M
- **Item Form:** Paste
- **Material:** Silicone
- **Special Feature:** Improves Adhesion on Flexible Elastomers, Contains Cure Accelerator
- **Specific Uses For Product:** Repair

## Images

![3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz, 1 Bottle, Designed for Difficult-to-Bond, Low Surface Energy Rubbers - Image 1](https://m.media-amazon.com/images/I/619rBEPCyhL.jpg)

## Questions & Answers

**Q: What are the ingredients?**
A: It is a mixture of acetone and C.A.S 67-64-1 (which is ch3coch3)

**Q: How is this applied? Does it come with an applicator of some sort?**
A: The cap has a small brush attached to it

## Customer Reviews

### ⭐⭐⭐⭐⭐ Holy smokes! Works like nothing I have ever used before!
*by R***R on April 2, 2024*

I repair things as a career. Like huge industrial stuff,1000ft long lake freighters, steel mills etc. I have access to so many expensive industrial chemicals and adhesives. None I had found were up to the task on a home project I was doing in my shop. I needed to bond a rubber boot to a part made from POM (Acetal) Both are difficult to adhere to. Nothing sticks to POM and anything strong does not flex with the rubber. LOTS of inter-web research and LOTS of claims and hype. I found that both materials were on an extensive list 3M had of materials P40 is comparable with. They were NOT kidding! It worked even without the primer! Like my first try I mis-located the boot a bit..... Too late! It is still stuck right where I put it. This stuff is ultra thin! Some part in the description says gel. NO! BUT! the way this stuff wicks into the gaps and stuff makes this all the better for me. I assemble the parts exactly where I want, a single drop at the joint......and it's capillary action pulls this stuff right where it needs to be! I've used it on a few more things playing around. THIS STUFF WORKS! HIGHLY RECOMMEND! The primer is a must have IMO. It gives the best chance at a successful bond, especially for difficult plastics. YOU PRETTY MUCH GET 1 SHOT AT IT! Ray the Maker

### ⭐⭐⭐⭐⭐ Really Sticks
*by E***E on December 15, 2023*

I am gluing silicon rubber to a stainless steel washer; a very difficult task. I first used just Scotch Weld PR40, plastic and rubber adhesive. I abraded the washer and rubber with 150 grit sandpaper. After 24 hours the rubber peeled off fairly easily. I repeated the experiment but used the Scotch Weld AC70 brushed on the abraded rubber. After 24 hours the rubber stuck very well even while pulling with considerable force! The primer and abrading are essential!

### ⭐⭐⭐⭐ It's plain old acetone!
*by G***Y on July 29, 2025*

It's plain acetone. Don't waste your money! It does have a cute little brush attachment tho.

## Frequently Bought Together

- 3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz Bottle
- 3M Scotch-Weld Plastic & Rubber Instant Adhesive PR40, Clear, 20 Gram Bottle
- 3M Scotch-Weld Plastic & Rubber Instant Adhesive PR1500, Clear, 20 Gram Bottle

---

## 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.com.ar/products/47209036-3m-scotch-weld-instant-adhesive-primer-ac79-clear-2-fl](https://www.desertcart.com.ar/products/47209036-3m-scotch-weld-instant-adhesive-primer-ac79-clear-2-fl)

---

*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-02-01*