I would have thought it would have to be some type of anti-seize grease, any reccomendations?

Cheers

Coppaslip ( or one of the generic brands of copper based anti size compound)

I use this.

Weldite Grease

I do/did use weldtite grease but after stripping my bottom bracket this week-end, I’m not going to use it again on the BB.
It doesn’t look like Weldtite can resist water, as it was all but washed away.

I have some marine grease in the garage bought for some other project years ago.
Shall be giving this a go.

In use copper based anti seize on the threads and coat all the other bits, including the bearing faces with silkolene RG2 motorbike grease. It’s always worked for me.