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I want to use green stuff to attach a 3/4" (19mm) magnet to the arm ball joint of my Phantom Titan. Is green stuff strong enough for the task? Is there something stronger? I also want to put a thin layer over the magnet to stop the magnets from slamming together every time I attach and arm. Thank you.

I think most people will use 2 part liquid epoxy rather than green stuff for the big boys.

Green stuff won't stick to the magnet very well, but it will give you a nice textured and recessed mount that you can then use for super glue or epoxy to actually hold.the magnet in place.

 Desubot wrote:
I think most people will use 2 part liquid epoxy rather than green stuff for the big boys.

I have JB Weld tonuse in place if glue. I was hoping that there was an industrial strength green stuff like substance to build around the magnet to hold it on better.

Glaziers putty maybe, or the silicone type adhesive filler stuff they use to stick together tanks for pets (fish, gerbils, etc). But to be honest using GS to build up a receptacle and a decent glue like the gorilla gel stuff would do the trick, and should be easier to handle.

The green stuff mount will be too soft to hold the magnet in place. Even if you super glue it to the mount, you are risking of tearing the whole thing away. I just use two part epoxy for anything larger than 8mm.
Super glue might hold, but it might fail at some point. Epoxy takes more time, but it's more reliable.
I would glue some rubber gaskets on to prevent them slamming.

Other alternative to two part putty would be millput.

and millput does make a black one that is VERY tough and hard to chip edit: iirc ( its been a while since iv used the stuff so grain of salt)

For titans you want proper 2 part epoxy.

JB Weld or JB Kwik would be my suggestions.

 Davespil wrote:

 Desubot wrote:
I think most people will use 2 part liquid epoxy rather than green stuff for the big boys.

I have JB Weld tonuse in place if glue. I was hoping that there was an industrial strength green stuff like substance to build around the magnet to hold it on better.

I used a variety of plumbers epoxy from a hardware store that worked similar to green stuff but adhered much better. It’s more difficult to use than green stuff though because it’s a bit more crumbly, sticky and cures faster.

I’ve also used some industrial paste type epoxies that stick insanely well and can be sculpted for about 10 minutes before going hard, but I’ve not come across them outside of industrial applications (buy a few litres in a $200 tub which only has a shelf life of 6 months once opened). Don’t know if anyone sells anything similar in hobby type quantities.

how about a countersunk magnet fixed with a self-tapping wood screw into a hole filled with 2-part epoxy glue?

 Desubot wrote:
Other alternative to two part putty would be millput.

and millput does make a black one that is VERY tough and hard to chip edit: iirc ( its been a while since iv used the stuff so grain of salt)

Is the black Milliput the strongest? I found it on Amazon and will probably buy it. I just want to make sure that I'm getting the strongest stuff I can. I am using JB Weld 2-part epoxy as well.

 Davespil wrote:

 Desubot wrote:
Other alternative to two part putty would be millput.

and millput does make a black one that is VERY tough and hard to chip edit: iirc ( its been a while since iv used the stuff so grain of salt)

Is the black Milliput the strongest? I found it on Amazon and will probably buy it. I just want to make sure that I'm getting the strongest stuff I can. I am using JB Weld 2-part epoxy as well.

The property is different

Millput is more on the hard rigid and brittle side vs green stuff which is more like rubber

imho jb weld will probably work way better

but alternatively the idea of using a counter sunk magnet brought up earlier will give you the BEST connection.

But depending on how you drill in and screw the magnet to the resin and the strength of the magnet YMMV

I'd use JB Weld for this. In the case that you need to build up a supporting structure (not relevant here), epoxy putty gives you similar properties to Green Stuff (although less elastic) to help fill gaps and properly position magnets.

Can I ask why you want to cover the magnets with anything? Direct contact makes for the strongest bond, and if either surface is painted there will be enough friction to avoid unwanted rotation.

Is this on a new FW Phantom? Are you building the arm to be pose able or trying to make it in a manner that allows for storage. Ill try to post pics of my FW Phantom solution.


Automatically Appended Next Post:
I use 2 sizes of square brass tubing, one that slips inside the other with no gaps. I drilled a larger than needed hole and placed the larger tube flush with the surface in the hole. i then slowly filled the void with super glue and baking soda. Baking soda will cause super glue to cure immediately it fills gaps and is sand-able.i then mounted the smaller tube in the arm with about .25 or.375 inch sticking out. to start I placed a small ball of greenstuff in the hole so that i could hold the tube in while adjusting it to ensure the joint looked right when assembled. once it was in the correct position i filled it layer by layer with glue/ baking soda to secure the tubing. the arms and torso joints are now rock solid and can be taken apart for transport. If I can figure out how to post photos again those will follow shortly.