Make a plan for old building insulation - How to proceed?

Why does it work with vacuum panels that are already ten times thinner than conventional insulation and have a similar insulating value as 2mm of this "paint"?
Then it would mean that vacuum panels shouldn't work either, which they do.
I understand what you mean, but what if the properties of the "paint" allow heat from a heat source in the room, like infrared panels, to be better retained in the room because it possibly distributes it better and at the same time does not let cold penetrate.
Although it was 7 degrees outside, the treated walls felt warm and dry to the touch.
The untreated walls were wet and cold.
Something seems to be working, and the question is whether that's simply enough for some.

The walls of the building are generally already ultra thick. Unfortunately, I didn't ask exactly how thick, but it feels like we're talking about at least 60cm. They already have their insulating value. Plus the properties that the paint brings, it might be enough there. Maybe if you hung infrared heaters from the ceiling, even more.

For new constructions, I consider it unsuitable compared to normal insulation methods, but for such special buildings, perhaps a good solution.

I will refer once again to the example of aluminum die casting. The microsphere mixture used there reduces the radiating temperature of the furnace by almost half, but more importantly, it maintains the temperature inside for a longer time, thereby increasing production many times over.

But let's make it simpler. I have the stuff at home. What would be a good experimental project that can be done at home to test the effect?

Why does it work with vacuum panels that are already ten times thinner than conventional insulation and have a similar insulating value as 2mm of this "paint"?

Great question. If you look at the structure of vacuum insulation panels compared to particles distributed in a liquid, you will notice that the few particles cannot have the same effect. And once again: use ubakus and calculate it yourself. The effect at that thickness can only be homeopathic. It is physically impossible to achieve the advertised effect. At least with a millimeter.

The walls of the building are generally already ultra thick. Unfortunately, I didn't ask exactly how thick, but from the feeling, we are talking about at least 60cm. They already have their insulating value.

In doubt, actually no insulating value. In a concrete bunker with 2m thickness, it is always cold. What the thick wall has is storage capacity.

Correct me if I'm wrong, but for a fire regulation in ISO or EN it absolutely does not matter whether it is issued for construction, vehicles, or anything else.

It does matter. The test setup is different and so is the evaluation.

If there is not at least proof of normal flammability according to DIN 4102 or EN 13501, the use is prohibited in Germany. Other European countries operate very similarly, and almost everywhere proof according to EN 13501 is required. This is very superficial for now, as there are many other small points that must be proven and observed to obtain usability verification.

The product data sheet already states what the material can do... with a 1 mm layer thickness we save 12% energy.... With 16 cm of styrofoam we achieve about 400%. To get there and meet the building energy law values, we need a layer thickness of about 33 mm (3.3 cm). Of course, this is a rough calculation and reality always looks a bit different, but it should suffice for illustration. The thicker the insulation layer, the smaller the increase in savings.

That is no longer a miracle cure and not economical either. I assume prices similar to those at Adam (about €400 per container). That is why he came up with the absolutely unrealistic thermal transmittance coefficient to get by with the 3 mm.

I understand what you mean, but what if the properties of the "color"

One more thing to think about. The "color" is supposed to work with microspheres containing vacuum. Still, the cbm weighs about 480kg. So there is relatively little vacuum inside and a lot of water/solvent. The vacuum insulation panel with the same insulating effect weighs only about 180kg – so it has multiple times the amount of effective vacuum insulation. How can the color have the same effect then? Maybe it's due to the test setup with 1mm thickness? You can also easily calculate with that.