Easy to Use for Any Edges, Corners or Joints. The Smart Caulk is the easiest way to finish your bathroom, kitchen and home sealing projects. Applying caulk and sealants used to be messy and time consuming, but now you can seal like a pro in minutes. Just apply caulk, silicone or grout, select a sealing edge and slide along for a perfect finish. Plus, there's no waste - just reapply the excess to extend the seal with no seam.