How to preserve calipers

[effvee]

Hi everyone, question, I just bought a set of front and rear 944 turbo calipers. It will be awhile before I can install them. At the brake fluid supply hole I used a steel brake line and bent it over in a vise. I feel that is not a good enough sealed method. There are brake caliper/master cylinders assembly lubes I could use. Do you think this rubber part brake friendly assembly fluid will be a good interior preserved? I know if not done correctly the pistons will rust.

Next if I need to totally rebuild the calipers is there a good source for re-building brembo caliper?

Thanks