3M™ Primer 94 can be used to promote adhesion of 3M™ adhesive tapes to surfaces such polyethylene, polypropylene, ABS, PET/PBT blends, concrete, wood, glass, metal and painted metal surfaces.
If you are having problems getting 3M™ double sided adhesive tape to adhere well on neodymium magnets, 3M™ Primer 94 can greatly enhance the adhesive strength of 3M™ adhesive tape on magnets or many other surfaces.
Why you need 3M™ Primer 94 for neodymium magnet?
A simple example is when you want to attach a piece of neodymium magnet to a plastic remote control.
Neodymium magnets are brittle and not machinable, meaning you cannot simply drill a hole thru the magnet to fit a screw. (For that, we recommend our countersunk neodymium magnets)
Titan Magnetics neodymium magnets are industrial grade magnets with super high magnetic pull force. A small piece of neodymium magnet is usually sufficient to attach a small remote control to a metal surface. The high magnetic force also means the adhesive/glue that holds the magnet to the remote control is fighting a tug of war with the magnet every time we detach the remote from the metal surface.
Getting these neodymium magnets to stick to non-ferrous materials like plastic, wood, tiles, glass, polycarbonate and etc. usually requires adhesive. The problem is that some surfaces (low energy surfaces) does not bond well with double sided adhesive and after a while, the strong pull of neodymium magnets will cause adhesive failure (eg. magnet attached to metal surface instead of staying with the remote control).
3M™ Primer 94, when applied to surfaces, increases the adhesiveness of the surface to adhesive tapes. This is especially useful when used together with strong neodymium magnets and 3M™ double sided adhesive tapes. It ensures that what is meant to stay, stays and magnets that are meant to be detach will be detach when pulled.
Keep away from heat/sparks/open flames/hot surfaces. – No smoking. Use only non-sparking tools. Take precautionary measures against static discharge. Do not breathe dust/fume/gas/mist/vapors/spray. Do not get in eyes, on skin, or on clothing. Do not eat, drink or smoke when using 3M™ Primer 94.
How to use 3M™ Primer 94
Always work in well ventilated environment with no open flame, spark or fire hazard.
Always clean the surface for adhesion with isopropyl alcohol pad to remove residue and impurities.
Apply a thin film of 3M™ Primer 94 on the surfaces that will contact with 3M™ adhesive tape, let it dry for 3-5 minutes but not longer than 30 minutes.
Apply 3M™ adhesive tape on the primed surface and apply firm pressure.
For best results, leave it to cure 24hrs before using. Most 3M™ acrylic foam adhesive tape achieve approximately 60% adhesion on initial pressure application, 80% after 24 hours and reaches 98% adhesion effectiveness after 72 hours as the adhesive substrates takes time to achieve micro bonding by flowing in to the crevices.
Usages for 3M™ Primer 94
– Increase adhesion for vehicle graphics/decorative films especially along edges and crevices where peeling and lifting
– Increase adhesive tape bond on neodymium magnets
– Increase adhesiveness on low surface energy materials like polyethylene, polypropylene, polycarbonate, ABS, PET/PBT blends, concrete, wood
See below video at 3:18 showing effects of sticker film on primed and un-primed surfaces.