A reusable countertop mold in accordance with the present invention includes a bracket member detachably secured to a rail portion of a cabinet member for a substantially horizontal substrate that receives deformable material upon a surface of the substrate. The bracket member includes vertical, horizontal and channel members integrally joined together for enabling a channel member to removably receive the rail member. The mold further includes a locking bolt for detachably securing the bracket member to the rail portion of the support member. A form member is detachably secured to the bracket member, the form member continuously extending outside the perimeter of the substrate and receives deformable material that ultimately solidifies; whereby, the substrate surface and the form member cooperate to configure a countertop that continuously extends upon and outside the perimeter of the substrate, thereby forming a countertop having an integrally joined overhang portion; whereupon, the reusable countertop mold is removed from the solidified countertop overhang portion and the rail portion.