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Attaching Magnets to Foam Board

#1
What are the techniques you use to attach magnets to foam board? Every time I use hot glue, the magnet just gets ripped out. The hot glue doesn't really adhere to the smooth surface of the magnet. I tried using some packing tape over the glued in magnets and that helped but they still get loose. Any ideas? Have you tried using CA?
 
#5
So I continued my testing...

Foam Tac - Nope. Good for foam to foam but not for smooth metal to foam. Pulled right out.
Foam Safe CA - YES! Worked great. Held strong without any tape. Solid with some clear packing tape.

Hope this helps somebody out there. I'm open to any other suggestions you might have. Happy flying.
 

PsyBorg

Wake up! Time to fly!
#8
What are the techniques you use to attach magnets to foam board? Every time I use hot glue, the magnet just gets ripped out. The hot glue doesn't really adhere to the smooth surface of the magnet. I tried using some packing tape over the glued in magnets and that helped but they still get loose. Any ideas? Have you tried using CA?
Put your magnets in from the back side leaving a layer of paper between them. For edges where there is no paper and you know magnets are going to be placed leave some paper to fold over and glue down after magnets are installed.
 

PoorManRC

Well-known member
#10
Put your magnets in from the back side leaving a layer of paper between them. For edges where there is no paper and you know magnets are going to be placed leave some paper to fold over and glue down after magnets are installed.
This is how I do my Magnets... The Paper keeps them from popping out.
For an adhesive, I used either Original Gorilla Glue, or Epoxy.

I've found with Epoxy, the FOAM will rip before the Magnet pops out!! 😊
 

BATTLEAXE

Well-known member
#11
There is a mechanical advantage you could use just in the magnets placement and is guaranteed to never rip out under normal circumstances. It you place the magnets on opposing vertical mating surfaces so the magnets part in a shearing motion, (pulled apart sideways, basically sliding them apart). This way there is no direct pull against the glue, depending on the glue to hold all the stress of pulling them directly apart. HG works just fine for this application
 

Monte.C

Well-known member
#12
(y)(y)
I use foam-safe CA for many assorted odds & ends. It's good stuff.
I use Gorilla Glue for most of my building. In a place like for the magnets where there's no need to deal with the foaming, I set things together, cover with a little piece of wax paper and a very flat weight on top of that. It cures perfectly flat.