I want to hit rougher walls. What type of paint marker would get me very bold clean lines. On concrete. Are we talking alot of bleed? Or mops..
If youre looking for a marker for rough surfaces then a streaker like a markal paintstick, sakura paint marker , or art primo solid markers would be your best bet but they sometimes dont leave a very solid like on rough surfaces. I dont know why you wouldn't just use spray paint but whatever floats your boat!
If the area is small get a paint stick like suggested above. If you want to "bleed" on a surface you can't use a mop on, spray with a fatcap up close and slow down your hand movements