Faux brick on wall using joint compound?

You have to use painters tape and tape out your grid on the wall. Spread your joint compound over it in a layer & remove tape before it drys. I’d tape it all but joint compound it & remove tape in small sections. Let dry completely before you paint.

there are stencils for this too, I can't tape a straight line ha ha, hope this helps xx

This site will help. Yes, tape or template will get the job done!!

https://www.google.com/search?q=do+they+make+a+faux+brick+template&rlz=1C1BLWB_enUS700US700&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjDjfPU7fbcAhUVIjQIHaq6BWEQ_AUICygC&biw=1164&bih=515&dpr=1.38

Saw this on Youtube. They are touting their products, but the idea is to use a stencil that has some little thickness to it and once applied to the walls, you then go over it with a stone/mortar compound (lightweight) - the video shows how it's done and the result is very real looking "brick." https://youtu.be/zllHde3z5u0