Paint the walls red. Mix about 5 litres of paint in a darker shade of red with 4 handfuls of Artex powder. Dab onto a stencil at the top and bottom of the wall. Join the two stencils with a straight ...

I tested Artex acrylic paint markers to see how they handle solid fills, brush tip control, and color layering. With smooth flow and full coverage, these markers surprised me in more ways than one.