---
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: "€ 65.43"
currency: EUR
in_stock: true
reviews_count: 8
category: "3 M"
url: https://www.desertcart.hr/products/47209036-3m-scotch-weld-instant-adhesive-primer-ac79-clear-2-fl
store_origin: HR
region: Croatia
---

# Fast-drying formula Boosts adhesion on tough elastomers 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:** € 65.43
**Availability:** ✅ In Stock

## Summary

> 🔗 Stick with the best: Instant adhesion for the toughest bonds!

## 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?** € 65.43 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/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

- • **Precision Application:** Ultra-thin formula wicks into gaps for seamless bonding 🧪
- • **Speed Up Your Workflow:** Fast-drying primer keeps projects moving without delay ⚡
- • **Unmatched Bond Strength:** Enhances adhesion on low surface energy rubbers like silicone and EPDM 🔗
- • **Versatile Industrial Grade:** Designed for challenging materials, perfect for professional repairs and manufacturing
- • **California Compliant & Easy Use:** Eco-conscious formula with straightforward surface prep for hassle-free application

## 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, capillary-action formula contains a cure accelerator to ensure rapid, strong bonds, making it ideal for professional-grade repairs and industrial applications. California compliant and easy to apply, this 2 fl oz bottle is a must-have for anyone needing reliable, high-performance bonding on flexible rubbers.

## 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: 3M clobbered it! - I was skeptical, but 3M nailed it. I used this product (along with Scotch-Weld glue for silicone) to bond silicone to silicone and it worked perfectly! Easy to use, takes very little, but bonds incredibly strong! It is pricey, but worth every penny. Does exactly what it says and does not take long to work. Easy to hide seams. This stuff is my new favorite way to bond silicone parts together! Thanks 3M!

## 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 | #86,201 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #24 in Adhesive Primers |
| Brand | 3M |
| Color | Clear |
| Date First Available | June 1, 2017 |
| Global Trade Identification Number | 00051115313882 |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Volume | 2 Fluid Ounces |
| Item Weight | 2.08 ounces |
| Item model number | AC79 |
| Manufacturer | 3M |
| Material | Silicone |
| Package Information | Bottle |
| Product Dimensions | 10 x 11 x 2 inches |
| 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 |
| Viscosity Level | Low to Medium |
| 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

### ⭐⭐⭐⭐⭐ 3M clobbered it!
*by C***. on February 16, 2026*

I was skeptical, but 3M nailed it. I used this product (along with Scotch-Weld glue for silicone) to bond silicone to silicone and it worked perfectly! Easy to use, takes very little, but bonds incredibly strong! It is pricey, but worth every penny. Does exactly what it says and does not take long to work. Easy to hide seams. This stuff is my new favorite way to bond silicone parts together! Thanks 3M!

### ⭐⭐⭐⭐⭐ Makes crazy good bonds, fixes nearly everything
*by H***S on February 16, 2026*

This Scotch adhesive is now my go to for difficult to bond materials. I haven't had it to fail yet. I've bonded rubber items, plastics, and hinges on headphones and it made quick, super strong bonds each time. This is the cyanoacrylate adhesive that you are looking for.

## 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

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---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-19*