The buzz in many parts of the plumbing world concerns one-step solvent cement. What you hear depends on what part of the country you’re in. Although the laws of physics are the same around the world, methods of joining plastic pipe surely aren’t.
BF Goodrich, for one, is vigorously promoting one-step solvent cement. The concept only applies to joining CPVC plastic pipe. This surprises many plumbers because their response is, “What’s the big deal! We’ve been joining plastic pipe in one step for years.” Of course, what they are usually talking about is PVC, not CPVC.