Hi Dave,

Can I use CPVC cement on standard PVC?

I'm not trying to be sarcastic, but what does the can say? When in doubt,
read the directions...

In any case, a small can of dedicated CPVC cement is cheap, and not worth
risking possible complications. If your can of PVC cement is old, it's
probably gelled by now anyway.

Regardless of which cement you use, remember to clean the pipe and fitting
first with the purple "primer".

Good luck,

Anthony