Some use them for only a certain complicated section of their painting while others make the whole mural using them.
Use a projector on tan concrete wall.
Once you buy all the materials it should cost less than 50 for the paints needed.
In conjunction with photo editing software they help you map out plan and design according to the difference in elevations bumps and gaps in the wall.
I have a 92 pj screen that has 2 slideable brackets at either end that can hold 4 screws in each bracket but the screws can not be any thicker than 6mm or the wont go through the holes i think the whole screen weighs about 13kg.
But there is another option available which is to use an outdoor wall.
The best solution for using a projector on a wall is to paint the wall with a projector screen paint.
Using the wall first will give you an idea of how big of a screen to get.
It is not 100 necessary but it allows the wall to reflect the light more efficiently.
Using an outdoor wall as a projector screen.
A quart of screen paint on amazon can cost about half the amount as an actual projector screen.
Start at 6500k and go up until the colors look decent.
The projectors can be of great help when working on uneven surfaces.
This is a permanent solution as it will involve painting the wall so i only suggest you do so if you are happy to proceed on this basis.
The tan wall will make the image look warm so just use a cooler white balance.
The issue with this type of paint is that it s not cheap.