Before you begin caulking your bathroom, make sure you use caulk that says, “for bathroom use only.” Make sure the caulk is waterproof and can safeguard against mildew, mold, and bacteria. When buying a caulk gun, make sure you choose one that is high quality. You do not want to cut corners on this detail. The better the caulk gun, the easier it will be to manage the flow of the caulk. While you can use a tube of caulk without a caulk gun. And don’t worry, caulk guns aren’t expensive.