GA native
Senior Member
I've seen adverts for a slime that they pump through copper piping to seal the inside and make it like new. That being said, it was years ago...so not sure if it is still something they do. Whole house copper re-piping isn't too difficult and can be done...but I figure PEX is taking over and would probably be easier/cheaper.
It's epoxy. Once upon a time, I worked on a cash cow condo-plex, that had polybutlylene plumbing. The condos were about 20 years old, and all the poly was failing. I've met one plumber, there at the cash cow, who did the epoxy.
Stuff seems like a nightmare to install. They have to go into the house, disconnect every valve, and cap it. Then one line at a time, they open the cap, and pump the epoxy into the the line. Then chase it with compressed air. Once all the pipes are coated, they have to let it sit overnight. Then you pressurize, and hope it doesn't leak.
I don't think it's done anymore.