start with the purple primer can first. This gets the pipe soft. Next you use the glue (actually called cement). I like to use the heavy duty one (I think it's the green can if memory serves me correct). If you are gluing two different materials together, let's say like PVC and ABS (the black pipe), you use the transition cement in the lime green can.
Home Depot and Lowes pretty much sell the Oatey brand. And don't be stingy with the cement. Really lather it on!
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