Abstract: An attachment for applicators used to apply liquid adhesive to a seam between adjacent edges of floor covering. The attachment comprises a support plate having a generally rectangular main body portion, an integral collar extending upwardly from the top edge thereof, and a pair or cylindrical rollers each rotatably mounted between pairs of projections which extend downwardly from the bottom of the main body portion. The collar of the attachment is adapted to be adjustably mounted on the cylindrical nozzle of a seam sealer dispensing head and held in place thereon by appropriate fastening means. In use, the attachment provides sidewise stabilization for the applicator and a means for setting and maintaining the desired angle thereof relative to the surface of the floor covering as it is moved along the seam therein.