From what I've encountered, grey is a medium body cement (not always true according to google), and clear is a light body cement.
Interesting thing though, when going and looking on the shelf here @ work, all the grey cement we have is single stage for schedule 40 or 80 fittings and not for pressure (ie sewer fittings). All the clear is 2-stage (primer/cement) recommended for schedule 20 or 40 fittings.
Now I'm curious and will inquire to one of our suppliers.
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28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable
Established March 2006
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