Abstract: A foil applicator tool for use in construction of stained glass panel assemblies is formed by a body having a plurality of grooves each of which have an upper portion with a base formed by shoulders for supporting foil in strip form. The upper portion has parallel side walls which closely receive the foil strip. Each groove has a lower portion centrally located with respect to the upper portion. The walls of the lower portion are parallel and closely receive the marginal edge of a stained glass panel and foil to fold the foil about the edge of the glass when it is pressed down into the lower portion of the groove with the foil interposed. The grooves extend over a substantially planar top surface of the tool body and over a curved end surface.