Does anyone know if something exists that can be used to repair a leaky cast iron drain stack? Basically, what I have is a nearly 40 year old cast iron pipe that has formed various pin-sized holes from which waste water leaks resulting in a rusty mess on the basement floor (it's gradual, but does accumulate over time). Before I go through the trouble of having the pipe replaced, I wanted to look into repair solutions. What I am envisioning is some sort of putty that will adhere to the pipe, is water resistant (or better yet water proof), and preferably can be painted. I've experimented with epoxy glues, but none set fast enough to prevent water from bubbling up underneath. The glue eventually fails.
The problem is that I cannot go for too long without running water through the pipe (flushing toilets, running water in sinks, and so on), so there is never enough time for the glue to dry completely (nor enough time for the pipe to dry enough to apply the glue, I figure).