---
product_id: 744700635
title: "3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz Bottle"
brand: "3m"
price: "VT281"
currency: VUV
in_stock: false
reviews_count: 5
url: https://www.desertcart.vu/products/744700635-3m-scotch-weld-instant-adhesive-primer-ac79-clear-2-fl
store_origin: VU
region: Vanuatu
---

# Fast drying in seconds Optimizes adhesion on tough elastomers Cure accelerator for rapid bonding 3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz Bottle

**Brand:** 3m
**Price:** VT281
**Availability:** ❌ Out of Stock

## Summary

> 🔗 Stick with the best—prime your way to unbreakable bonds!

## Quick Answers

- **What is this?** 3M Scotch-Weld Instant Adhesive Primer AC79, Clear, 2 fl oz Bottle by 3m
- **How much does it cost?** VT281 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/744700635-3m-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

- • **One-Shot Success:** Maximize your bonding confidence—once applied, parts stay exactly where you place them.
- • **Lightning-Fast Dry Time:** Keep your projects moving at industrial speed with near-instant drying.
- • **Precision Bonding Power:** Ultra-thin formula wicks into microscopic gaps for flawless adhesion.
- • **Eco-Conscious & Compliant:** California-compliant formula that meets professional standards without compromise.
- • **Versatile Elastomer Compatibility:** Engineered to bond silicone, EPDM, TPE, and fluoroelastomers effortlessly.

## Overview

3M Scotch-Weld Instant Adhesive Primer AC79 is a clear, fast-drying primer designed to enhance adhesion on challenging flexible elastomers like silicone, EPDM, and TPE. Featuring a cure accelerator and ultra-thin formula, it ensures precise, durable bonds on low surface energy materials. Ideal for professional-grade repairs and industrial applications, this California-compliant primer streamlines surface prep and guarantees reliable, one-shot adhesion every time.

## 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.

Review: 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: 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 |
| Batteries Included? | No |
| Batteries Required? | No |
| Color | Clear |
| Customer Reviews | 4.2 4.2 out of 5 stars (110) |
| Date First Available | 5 July 2025 |
| Item model number | AC79 |
| Material Type(s) | Silicone |
| Product Dimensions | 25.4 x 27.94 x 5.08 cm; 59 g |

## Product Details

- **Brand:** 3M
- **Item form:** Paste
- **Material:** Silicone
- **Special features:** 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 Bottle - 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

### ⭐⭐⭐⭐⭐ Review
*by R***R on 2 April 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

### ⭐⭐⭐⭐⭐ Review
*by E***E on 15 December 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!

### ⭐⭐⭐⭐ Review
*by G***Y on 29 July 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

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-16*