Hi all, bringing this thread back with a related issue:

One of the soft brake lines I installed is leaking where it screws into the hard line. I have tried cranking it down pretty hard (with the proper flared wrenches) but it still leaks.

The other side, I was able to just snug it down and there's no issues.

I always though thread sealant was a no-go, but Uncle Kent has a kit for this job (of course) and the kit includes a liquid thread sealant.

Assuming using liquid thread sealant is ok, what kind do I need?

Thanks!