I am currently spraying my house with a Bosch PFS 5000 E. It was once available on Amazon for around 100€, so I wanted to give it a try.
Masking is extremely important. Do this during the construction phase. No doors installed, no floors laid, no sockets or switches. Then it works. The floor can stay free, afterwards just go over it with a floor scraper; you just have to be careful around the windows.
The device is perfect for priming with deep primer. You need goggles, hearing protection, and a mask. It can be done alone.
If you want to paint, then a second person MUST follow with a roller. Apply generously once, and then roll once from top to bottom with the roller. Moisten the roller with water at the beginning. The roller compensates for unevenness from the spray pattern and gives a slight texture.
You have to paint twice. Then it looks good.
The device applies a lot of paint to the wall in an extremely short time. You have to reload every 90 seconds, you cover the meters; the person with the roller can hardly keep up.
Especially practical on the ceiling.
Since the roller is not dipped, it hardly gets paint-wet and is therefore not heavy – the work with the roller is in no way comparable to real painting with the roller. Very easy work.
The paint must be strained so there are no clumps. There are large hair strainers on Amazon for little money. Also buy a large measuring cup, 2 or even 5 liters. Then stir the paint mechanically, mix in 2-3 teaspoons of orange or yellow tint (so you can better see where you have been, and the color is not so cold), then stir in about 1l of Tiefengrund LF as thinner per 10 liters. Then strain the 2 or 5 liters into the measuring cup. And off you go!
You must not take work breaks, then everything dries up and clogs. 75m² of living space without the ceiling is a relaxed morning. Afterwards clean everything under plenty of running water, or put it in a bucket if you want to continue the next day.
The paint consumption is somewhat higher, but we painted with the 25€ for 10l paint from Toom. Co-builders had StoSil – 10l for 40€. They also had to go twice. With a roller.
I would do it again immediately and can only recommend it to everyone.