Gluing Magnets: Three Tips for Avoiding a Sticking Situation
By Shalea Hardison
Gluing magnets can be one sticky situation – and not just literally. It’s tricky to make sure the magnet stays where it’s attached, not where it’s attracted. We’ve found when it comes to adhering magnets, there are three key steps to creating a successful bond: preparation, selection and cure time.
It’s often overlooked, but surface preparation is makes a significant difference in achieving a strong surface bond between a magnet and the adhesive. Make sure the surface of the magnet is dirt and oil free by wiping it with rubbing alcohol. Magnets with smooth nickel coatings, like neodymium magnets, typically need some abrasion to improve adhesion. A quick swipe with a fine grit sand paper does the trick. Of course, be sure to clean off any residual dust. Taking a few minutes to prep the magnets can save hours of headaches down the road.
If you’ve been to the store to purchase adhesive recently, then you know the selection can be overwhelming. Choosing the correct adhesive is critical. There are several excellent options available, and selecting the right adhesive depends on the material you are affixing the magnet to.
For most surfaces, such as metal and wood, the typical strong adhesives such as two-part epoxies, Loctite, Liquid Nails, Super Glue, and Gorilla Glue all work well.
For craft projects with light-weight magnets, double-sided tape and Glue Dots hold just fine. Low temp hot glue can be used with ceramic magnets – but not with neodymium magnets. The temperature of the glue can lower the strength of those magnets. Plastics pose the most challenging surface to attach a magnet to. Choose an adhesive specifically designed for plastic. 3M, E6000 and Loctite make excellent choices.
As a point of reference, one of the adhesives we use on our neodymium magnets is a Low Surface Energy foam tape from 3M, making it effective for plastic surfaces.
This last step is the hardest – we all want to test our projects or speed up manufacturing, but none of the preparation and gluing matter if you rush right into use. Giving the adhesive proper time to cure is the last step in ensuring the bond holds tight. Follow manufacturer directions to determine this time. Keep in mind that high humidity environments and excessively thick applications of adhesive both slow down cure time.
For our own magnets with adhesive, we recommend 24 hours cure time. Because we understand the importance of adhesive, we offer some of our magnets with a pre-applied adhesive. Do you have any other tips you would add? Let us know in the comments below.