I recently had purple cleaner and only CPVC glue. I used it because I was repairing a sprinkler fitting. I would never use it for any pressurized line or particularly a PVC line inside a wall. As it turns out, right after I used the CPVC glue on my sprinkler, I went to put it away and there was my PVC cement. How did I miss it?:confused2: The real problem with these products is that the normal homeowner has a lifetime supply in a single small can. What do you do with 10 year old PVC cement? IF the can is rusty, I won't use it. I just go buy another fresh can. The old cans burn really well when dumped on the burn pile before lighting.