I always put the cement on the male part of the joint so that I don't push excess inside the pipe. I prefer medium duty clear, and wipe off the outside as soon as I push the two pieces together.
Although I agree that putting cement on both surfaces would be best (and when I have plumbed real water lines in/around my house, I do), for out purposes it is just not necessary.
No primer for me, ever. Just a extra step that, once again, just is not needed in this case.
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Current Tank Info: 120 mixed reef with 40b sump, RO 150 skimmer, AI Sol Blue x 2, and a 60g Frag Tank with 100g rubbermaid sump. 2 x Kessil A360w lights, BM curve 5 skimmer
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