People might say that is is because air has no source to absorb the paint but even air has molecules so then, why is it that we can't paint in the air?
closed as off-topic by Separatrix, L.Dutch♦, F1Krazy, Mołot, dot_Sp0T Apr 18 '18 at 9:13
This question appears to be off-topic. The users who voted to close gave this specific reason:
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With science and tech we have today, and probably in the future as well, it can't be done (In a way that resembles other types of painting, like the example you give in your question).
The main reason is that air is gas, and to paint it, you would need gas as well. The way gas behaves is expanding to fill what ever container it is in. (Not exactly expand, a more accurate description would be to say that gas particles tend to move apart from one another).
This causes a problem, because if We were to release a "gas-paint" it would quickly spread away.
If we would take a closed space (e.g. a glass box) and fill it with said "gas-paint" it won't spread, but would be either heavier or lighter then the air in the box, causing it to either collect on the bottom or top (respectively) of the box.