Abstract: Applicator tools for joining seams in floor and wall coverings are provided. The seams created by the tools disclosed are stronger, of better appearance, and provide a longer seam life. The applicator tools disclosed include means to engage a container of sealant, the tool having a foot at one end, with a leg portion above the foot of the relatively narrow cross-section, whereby the foot may be passed under the edges of the materials being joined. A conduit communicates with the sealant container, and with openings in or near the foot, to ensure effective sealant application to the materials being joined, both under the edges of the material, and on the edges of the material itself.