In know that PVC should be chamfered and even lightly sanded before gluing for better insertion on the fitting (and probably some other reason).
What about CPVC, a manual told me to just cut, apply glue and insert the pipe into the fitting keeping pressure. No sanding, no chamfering and no wiping with primer. Another article told me to chamfer the edges before gluing. So what is the correct procedure?
About the only reason I could see to chamfer the end is that it would seat a mm or 2 deeper in the fitting. In that the glue is solvent welding the plastic, I doubt it makes a lot of difference in the strength of the joint. That said, I don't see that it would be a problem if it helps in joining unless you overdo it (like sharpen the end).
As far as I know, primer and sanding serve the same purpose - primer softens the surface and sanding gives more surface area. Both of these improve the performance of the solvent. Whether you need primer or not depends on the glue - there are single step glues that combine the primer and cement and there are two step glues that require priming then gluing.
I have owned one for years, it aids insertion and helps remove tailings that otherwise would flow down the line necessitating more thorough flushing (or maybe plugging something up). It's a good practice but no requirement. As for CPVC cleaner or primer, follow the directions on your can of cement.
