I have cast iron pipe, built in 1970. A galvanized connection is LEAKING. The scale and rust stops sewage from gushing out. Another leak is bugging me too, it is a little newer and a donut gasket connection. Rust blobs are appearing at the connection. How can I fix it? Will epoxy putty fix the leak? I HAVE NO WAY TO CUT CAST IRON WHATSOEVER. My idea is to use a pipe patch on both leaks until I can get a plumber. I can cut galvanized with a jumbo pipe cutter. That area used to be a wall (in the crawl space) so the joists will get in the way of pipe cutter, among other obstructions. The rust blobs are auto-genic healing, I think. The cast iron often gets clogged, several times a year. PLEASE HELP! The pipe must be rusting up. I may have to replace it.