I recently purchased an older house with a couple of not so old additions. One of these additions is a bathroom where PVC is used as the waste pipe which subsequently joins to the original cast iron waste pipe. Instead of using coupling pieces to connect the two, whoever did the work used a bondo-like material to join the PVC and cast iron pipes together and this is now starting to leak slightly.

I will be having the joint repaired properly when we remodel the bathroom but in the meantime I would like to patch the bondo-like material with something similar. Anyone have any idea what the bondo-like material might be? It is white and hard (not plyable), surrounds the whole joint and probaly was applied 20 to 30 years ago. It looks more or less like really poorly applied, hardened caulk (not smooth). Or is it actually bondo?

If no one knows what it might be any suggestions as to what I could use to patch it?

if it is truly TEMPORARY while waiting for the plumber:

self melding repair tape COPIOUSLY applied

[www.bing.com]

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

There are substitutes for lead in a caulked joint, one brand is Soil-o, if it is still around - there are others. The joint is packed with oakum, which swells and makes a tight joint when it gets wet. The soil cement goes on top and holds it. But, you also could have a poorer set-up, with epoxy putty and no oakum, or some such thing.