HD told me they don't sell it anymore because of a law suit. Something about when it burns it gives off poisonous gases that can kill you. Seems like they would just sell it with a disclaimer.
I would be afraid of ordering too much (waste) or not enough (and be in trouble).
I'm trying to minimize the amount of pipe used but won't really know exact measurements till I have the major components sitting here. Most of my projects take about a dozen trips to HD because you always need a little piece of something that you didn't think about.
In order to minimize the amount of pipe I've drawn the following diagram:
The dotted lines are where the wall covers the back of the tank. I was thinking about simply extending the plywood base that I'll put on top of the frame and run this through the wall into the fish room. This would create the ledge even with the tank to set the pump for the OM unit. Will it all fit like as in the diagram? Won't know till the tank is actually finalized (i.e. - how big that external overflow ends up being, the exact dimensions of the pump used, etc.....
Worse case scenerio, I simply build a shelf at the right height to accomodate everything but I can't see putting the pump on the floor and running extra pipe that would end up blocking my access to the rear of the sump area.
How about regular Sched 40 PVC so it is easily obtainable and simply using that the spray paint that is for plastic. I've used the stuff on patio furniture and it holds up very well and I obviously wouldn't paint anything that would actually be touching water.