Once you’ve painted the wall in white and it’s dry, decide on the basic layout of the design and at what height it should begin. Wipe a piece of chalk along the length of your string. Pin it to the wall at one end and select the angle..
Hold the string taut and ‘ping’ it to leave a line. Using the tape, mask along the line, then repeat for the intersecting lines. Repeat for the other colours..
Stir paint well before pouring into the tray. Paint up to and slightly over the tape line with a roller.
Carefully remove the masking tape and admire the results. .