Repairing facade cracks - which material?

Hello everyone,

hopefully a quick question.

I have small cracks (hairline cracks) in the facade on the weather side and am currently painting anyway. For painting, I am using Zero Fassade 95. What should I best use to fill the small cracks? There are all kinds of things for this. Soot filler, painting fleece, quartz primer, or is it all the same after all? I have now used the Zero Renotec quartz primer, or do you have a recommendation for me?
Best regards
Andi

I recently had a tube of Strukturacryl in my hand that said you can use it to fill small cracks in the facade and then paint over it. But if the entire facade has hairline cracks, that can't be a solution either.

Please define "Haarriss" with a crack width chart or photo (or both).