Refurbing calipers - do I use sealant on the piston seal?

[Bennet]

I'm refurbishing some calipers this weekend. (As in, disassemble, clean, reassemble with new rubber bits.)

Haven't done this before. When installing the new rubber seal on the piston, do I need to add sealant of any kind to make sure it seals properly? Some videos mention this, and some don't.

If so, any recommendations for what to use?

[Bennet]

Red rubber grease it is then. Thanks.