Abstract: A sand-blast sign-making apparatus for forming a plurality of horizontally extending and alternating grooves and peaks on the planar front surface of a degradable blank of synthetic substrate material having a non-degradable stencil removably applied thereto. The grooves and peaks are formed in the portions of the blank surrounding the stencil and are intended to simulate a naturally weathered or sand-blasted piece of wood with the peaks representing the hardest grains in the wood. A sand-blast hose is supported upon a carriage assembly which is movable simultaneously in both the horizontal and vertical directions. The hose is directed at the blank and a grille having a plurality of stock blades positioned in spaced, parallel planes is positioned between the hose and the blank.