I am going to build my PVC overflow. Today I am going out to HD and getting the stuff I need. My ? is what kind of cement do I use for white PVC pipes? Do I need a primer and then the cement? Is it safe for fish?
Use the PVC cement outdoors, and keep it away from any source of ignition. It's quite flammable. I would leave it outdoors for quite a while, as it's stinky, and a pilot light on a stove, or furnace could make it a bit dangerous. Otherwise, the glue is easy to use, just hold the parts together for a bit, as they will try to separate until the glue sets.