the mesh of criss-cross lines on the wood) and primed it with a weak solution of PVA (white craft glue). About one part of glue to five of water is fine. The scoring helps to give more purchase for sticking the pieces on, and the priming helps stop the adhesive or the grout from drying too quickly (which can weaken it). I've measured out and pre-drilled the holes for the screws that will fix the number to a wall, and sketched an outline of the numbers. Ready to roll!!