also preferably a hot melt material and more preferably a polyamide hot melt material furthermore when the adhesive 104 is applied four raised beads 106 and 108 of adhesive are formed as shown in fig5 although the beads 106 and 108 are preferably formed by the adhesive it is within the scope of the present invention to apply a separately formed bead to the tape 100 by using the adhesive also applied to the adhesive are two stiffening strips 110 the stiffening strips 110 are preferably made from polyvinyl chloride and provide a rigid straight surface so that tape will provide a flat straight seam whether the tape covers a flat seam of two adjacent pieces of wallboard or is folded to form an inside or outside corner bead where two pieces of wallboard meet at an angle also provided on an underside 112 of the tape 100 is a protuberance 114 preferably formed from a polyamide hot melt material the tape 100 in one embodiment is preferably about 3 inches wide and about 0 009 inches thick and the stiffening strips 18 are preferable about 1 063 inches wide and about 0 025 inches thick each and separated by about 0 125 inches the raised beads 106 are preferably about 0 015 inches in height above the skim coat or tapered coat of adhesive which is about 0 002 inches in thickness and the beads are about 0 030 inches wide moreover the raised beads 108 are preferably about 0 020 inches in height above the skim coat or tapered coat.