A major caulking job can easily fatigue your arms. But not if you're armed with the Milwaukee M18 Cordless Caulk Gun ($300). The Milwaukee M18 Cordless Caulk Gun offers 950 pounds of dispensing force for the most demanding applications. This tool also has a variable speed trigger allows for great control of flow rate and bead width, a rechargeable, compact RedLithium battery, a 10-minute charger and a  rotating quick-change collar that can be configured to accept 10-ounce and quart-size carriage, as well as 20-ounce sausage-style barrels.