Hey jonos
Iv been using weber pral m for around 8 years it's a good product not quite as good as parex. But it's still quite good, I found that pral m goes off a lot quicker than others like Parex,
the way I would use pral m....... 15mm coat onto block work. Mesh around window and doors with the mesh embedded into the render a minimum of 6mm, don't just tack the mesh on then spray or spread over it, if you do that the mesh will not work properly,
Spray/spread( I prefer spraying) rule with either sedated rule or normal rule, then spat, in summer you will defo get a same day scratch winter put on late afternoon the day before. Scratch..... Make sure you use an I section.. The wall will be 10 times flatter than if you just use a scratch float, brush the wall down after you have finished scratching
hope this has been some help
regards and good luck