2 for 2! Acrylic and other sinks, other that stainless or steel enamel, are rigid and heavy enough that they stay put by themselves. A bead of caulk UNDER the rim seals it , and also acts as an adhesive. You can wipe away any caulk which oozes out, leaving a very small and neat looking bead. Use wet cloth or finger for acrylic based caulks, and denatured alcohol for silicone .