Re: Knockdown on walls
The consistency should be similar to that of pancake batter You want it just runny enough to flow through the sprayer, yet hold it's shape when it hits the wall. You can play with the consistency until you get the desired pattern you're looking for.
You will spray the texture and let it set for a bit to "tack off", that way when you run the drywall knife over the top of it to knock it down (hence the name knock-down texture ) the knife rides over the ridges without smearing and making a mess of things.
The nice thing is if you screw it up, you can remove the texture while it's wet and redo it.
Another note, you can either use dry mixed texture or thin down drywall topping compound with a little water. Topping compound is cheaper and more forgiving, but takes longer to set/dry before you can knock it down. Dry mixed texture dries faster and can be knocked down sooner, but getting the consistency right is more difficult and mixing is a pain without a drill and mixing wand. I recommend topping compound, it's just easier all the way around.
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