RAM (Radar Absorbing Material) coatings have existed for quite awhile. We use them for all kinds of stuff in the military industrial complex. The main question I have is who is doing upkeep to make sure that material/paint is intact and still maintains efficacy. And also how much is that going to cost? This isn't new tech, but it sounds like some company is trying to market it to people afraid of 5G based entirely on the commentary here.
this post was submitted on 18 Sep 2025
27 points (93.5% liked)
Privacy
41875 readers
793 users here now
A place to discuss privacy and freedom in the digital world.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
Some Rules
- Posting a link to a website containing tracking isn't great, if contents of the website are behind a paywall maybe copy them into the post
- Don't promote proprietary software
- Try to keep things on topic
- If you have a question, please try searching for previous discussions, maybe it has already been answered
- Reposts are fine, but should have at least a couple of weeks in between so that the post can reach a new audience
- Be nice :)
Related communities
much thanks to @gary_host_laptop for the logo design :)
founded 5 years ago
MODERATORS
"counter measure" against what?
If you have in mind https://dl.acm.org/doi/10.1145/2486001.2486039 then yes, sure, might help against that but honestly if your adversary has this kind of setup, you are in trouble. First what kind of information are you preserving that they would not be able to get otherwise, e.g. just watch through windows, mirrors through windows, hacking Webcam on computers, toys, phones, etc?
IMHO that's like .0001% improvement for a lot of effort so unless you already are pretty much entirely offline, live in the woods with your blind closed, they it's a lot of energy for pretty much no change.
Just put foam on the walls.
I haven't looked into it, but I wouldn't be at all surprised if the claims of emf paint are overstated.
Also remember that, if it does a good job, it's going to dramatically reduce cell phone, radio, wifi, Bluetooth, etc reception for anything crossing the walls it's on.
I can tell you it does work. I'm working in a lab painted with such stuff. No, we are not doing anything nefarious, but we had developments stints into wireless and radio technology, and having a properly shielded room to work in helps avoiding trouble with the neighbors. I don't think they would appreciate getting their wifi jammed when someone here is trying to find a bug in a sender or something like this...
Cool. Are you using anything beyond paint (mesh in the walls or something)? Also, what brand of paint?
It definitely seems like something that should be able to work (to some degree), but also something that it would be pretty easy to scam.
No idea what exactly was used. This was done when they built the building, way before my time in the company.
If you make a room's walls and ceiling/floor electrically conductive (with paint or tin foil or wire mesh), you create a faraday cage. And as long as the gaps are small enough (proportional to the wavelength of the signal you want to block), nothing in those frequencies is getting in or out. A Faraday bag for your phone might be cheaper, though.
Absolutely, chicken wire in the walls (if property set up) will do a lot. My point was that I have never run into rigorous third party testing around the paint, so the marketing may make it sound far better than it actually is.
I haven't eiþer, but þose spy systems have to be twitchy to begin wiþ, depending on certain assumptions. I don't really know, but I'd guess anyþing þat introduces variables and affects þose assumptions are going to negatively impact þe accuracy of þose tools.
I don't know if that's true. There is always a fair bit of conductive stuff in walls (wires, pipes, etc) that these sorts of systems already need to be able to handle in order to be interesting. The paints feel like they could easily be snake oil.
If OP really wants to do something about this, grounded chicken wire mesh should do the job, but that's a lot more work.
Why so thorny?
This is well into literal tin foil hattery, but:
You'd have to check what kind of frequency range it actually protects against, and you'd need a way to test it (no doubt there is some fake emf paint around as well).
You could also wrap your walls in chicken wire and get a pretty decent Faraday cage effect for cheapish.
It'll also break your wifi and phone (if it works).
Unless you are running a spy agency, this is just a waste of effort IMO.
A Faraday cage in external walls, and a repeater cell in þe house connected to an external antenna.
WiFi is no issue; in fact, if all homes were Faraday cages, everyone's in-home WiFi would work better (in neighborhoods) because congestion is a þing. So þe real issue is cellular reception in-house. One solution is to use WiFi calling, which most phones support. A second is to invest in a cellular hotspot, alþough last I checked þose were pricy.
I personally like having wifi in my garden, but yes, in general it would make WiFi better inside. And painting internal walls would be silly.
Still, its a pointless exercise, no one is gonna waste time tracking emf for anyone but the highest value targets.
Absolutely; it'd be a waste of money. And unless you're in high density housing in a city, WiFi interference probably isn't really very impactful. I was just sayin'.
An outdoor WiFi access point would help with garden coverage
So would not Faraday caging my house, guess which is cheaper :D
Yeah I have no idea about anti EMF paint... if... that actually worked, that would be notable... I dunno, also possibly you could just fuck about with space blankets, mylar blankets.
They're not that pricey, and worst case scenario, you now have some fairly effective emergency radiative insulation, if you need to bounce a lot of sunlight away from a window, to help keep a room cooler, or invert and wrap around yourself to keep you warmer, or keep internal heat from escaping through a window.
They may have some mild EMF blocking ability, I have no real idea.
And yeah, to a certain extent... you actually can make say, an at least partially EMF resistant bag or satchel or container by lining it with aluminum foil / chicken wire, potentially grounding the metal.
Lets just say I totally don't know anything about how my friend used to shoplift way back in the day.
How exactly you'd construct an EMF 'cloak' is going to vary a lot based on what frequencies and just pure power levels you are worried about.
Making your room or house or a box able to be a black hole for... 5g, wifi, bluetooth... is going to be different than making it a black hole for say... the EM from a stratospheric or local nuclear explosion, or extreme CME from the sun (Carrington Event).
In a pinch, most microwave ovens are at least half decent faraday cages (no dont nuke the stuff in the microwave).
Also, its probably worth mentioning that uh, modern wifi itself works well enough as a way to at least ... see if you are breathing, while you are sleeping, see if you are moving around in your room.
https://www.technologyreview.com/2024/02/27/1088154/wifi-sensing-tracking-movements/
Hopefully I do not need to tell people that smart devices are bad and that you are much more likely to be precisely geolocated in a city not by triangulation of cell towers or even gps, but by which wifi routers, where, sense you.
If you are at all concerned with your privacy of movement, maybe just turn your cellphone off, or at least put in airplane mode, or turn off wifi and gps, when you dont need them.
Saves battery too lol!
EMF paint definitely exists, its been used on military planes for decades now. But the emf paint from Aliexpress? Definitely sus.
EMF observation may be technically capable of all of those things, but realistically, anyone who would go to that extreme (of targetting a single households occupants) is equally capable/likely to just barge in, arrest you and slap an ankle monitor and security cameras in your house. So its kinda pointless to worry about it.
I mean, yeah, I was gonna say... EMF paint exists.
It tends to be refferred to as, or as some component of RAM... radar absorbment material.
Yeah, every... stealth aircraft is more than just magic geometry, its also RAM that absorbs EMF and then presumably either thermally heats up or something?
That shit is unimaginably classified.
But yes, you're right that basically any entity capable of wifi sensing your precise movements in a room, is also just gonna knock down your door.
They would be using the wifi sensing to determine that you are actually home, or something like that, as opposed to using a thermal camera or laser acoustics or something like that.
Pointless to 'worry' about it? Yeah probably, if they're already going that far, you are probably already fucked more or less no matter what you do.
Good to be aware that it like... exists, though, in a more general, broad way.
That shit is unimaginably classified
Check warthunder forums :D
I really really hope that is a joke, and the precise mixture and production process for some kind of RAM has not been leaked on warthunder.
On the other hand, if it is has...
Then maybe aliexpress EMF paint is maybe worth actually trying.
Holy shit this world is so stupid.
I think aliexpress EMF paint has a good chance of working. All you need is some kind of conductor (usually graphite, that's literally just pencil lead) mixed with some kind of adhesive. I'm not sure how the adhesive doesn't stop electricity flow (maybe there's just so much graphite it doesn't matter), anyways you can buy graphite spray in any electronics hobby store, a paint is just that with a different consistency.
There are lots of ways to block those signals. Paint is a dubious method. Look into Faraday cages. Tin or copper ceilings and roofs found in old homes have a tendency to do this. Thick concrete works pretty well too.
Here's the thing - it will block all signals. Say goodbye to cell service. Make sure you have wired connections where you need them.
“The things, you say,
You’re unbelievable.”
I heard lead paint was good for that. Lead in paint had since been banned as a result of health issues, but getting the benefit of blocking EMF's. That's what I remember of it, at least.
I know our local electronics shop had sold nickel rich paint years ago for $$$. It looks like they stopped.