Rebeding fittings. Best practices?

[Snowpetrel]

I've finally pulled the mast. Its nearly stripped of all fittings, and after removing all the flaking paint I'll rebed the fittings, provided I find nothing to nasty underneath them.

I've always beded them on Duralac and plastic sheeting. Is there a better way? What about using sikaflex or similar sealant, or lanolin?

Duralac vs Tefgel, I am thinking tefgel might be better for fastenings. Any other options?

The mast currently has a mix of heavy monel rivets and metal threads securing the fittings. Whats going to be better, or should I go for something else like rivnuts?

I will most likely leave the mast completely bare after stripping it. Any ideas on the best way to sand and protect the aluminium, is something like Hemple alu-protect any good?