As I mentioned in my YouTube video, I am building a structure based on Pelle Soebergs version of an oil recycling facilty. He used sray glue and fine sand for his stucco serface. But I have used a tried and true method that I have used before. Titanium white oil paint dabbed on with a stiff paintbrush. Heres how.
This is the before picture.
First you spread a liberal coating of the paint on the surface. Look on the right hand side of this wall.
Then using a stiff bristle brush you just start dabbing the paint so it leaves very small points of paint. Need to be small or they will look out of scale.
You may need to go over the wall several times with your brush, cleaning the excess paint off the brush as you go. Heres a look at the front wall.
This wall needs a bit more dabbing to bring the texture down more so its closer to scale size and some additional paint to cover those seams. But this should give you a general idea of what it should look like.