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No need to use primer. The primer is used by inspectors to verify the joints have been cemented. Primer actually soften the pipe a little. It's just a light weight cement dyed purple so the inspectors can see it. I have read studies that joints using primer are weaker than joints with out it. I usually put cement on both pieces being joined. Although once I found I assembled a joint with out any. It didn't leak for about a year when it got really hot
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