Loctite’s threadlocking compounds are used by automotive professionals everywhere to secure critical fasteners. Unfortunately, Loctite’s popularity has resulted in a wave of counterfeit products that can look remarkably like the real deal.

Everything from the bottle, to the branding, to the threadlocking compound itself is intended to deceive the casual eye.

Repair professionals use Loctite on a regular basis, and it’s regularly specified in OEM manuals. But, both mechanics and vehicle owners should be aware of potentially fraudulent adhesives on the market and know how to spot them. The fake stuff isn’t just dishonest – it’s dangerous. Loctite’s own testing shows that counterfeit threadlockers do not perform nearly as well as the genuine stuff, like in this comparison video. (Test starts at 6:32.)

How widespread is the fraud?

At the very least, hundreds of thousands of fake Loctite bottles have been made for sale to unwitting customers. In 2019, Shanghai police busted a large counterfeit threadlocker operation with over 100 individuals suspected of ripping off Loctite’s packaging and products. Xinhua News, China’s official state news agency, reported “the seizure of more than 470,000 fake Loctite products and labels worth around $7.1 million.” Police reported that this specific group had been active since at least the previous year.

The fakes seem to be most prevalent in online sales. Stock images of genuine products can be used to help sell copycat bottles.

Here’s a sampling of Loctite bottles from my home garage. The bottle on the right is the newest, and it has a QR code on the label. But when the code was scanned, it did not pass Loctite’s authenticity test, so it will be retired. Photo: Mike Apice.

Fakes are big business

If you purchased your Loctite from somewhere other than an authorized dealer, there is a chance that you are reaching for a bottle of unknown goop in your shop instead of a real threadlocking compound. Henkel Adhesives, the company that manufacturers Loctite, is aware of the problem and has taken steps to make their products harder to clone. These measures only work if you know about them, though, so here are a few things to look for if you have a suspicion about your shop’s supply.

Don’t be fooled

I reached out to Henkel for some more details on the fakes. Of course, Henkel’s technical team recommended fully testing any suspicious adhesive to make sure that it performed as expected. That’s a fine solution for a production environment with fancy testing equipment ready to go, but what are average auto techs supposed to do?

“Visually, I believe that beyond the features of the bottle, identifying a proper batch code and ‘use by’ date on the back of the bottle would be [worth a] check,” says Michael Feeney, a lead application engineer at Henkel. “Additionally, they could ask for a certificate of analysis to the corresponding batch code to confirm it isn’t just a made-up batch code.”

Not sure where to start with that? Drop Henkel a line here if you think you’ve got a fake, and consider buying from another source next time.