External Ceilings

I know this must be a simple one and probably resolved with a phone call to British Gypsum but what finish do you use for an external ceiling or wall for that matter?

Ive got a 110m2 undercroft open sided Garage ceiling to finish onto Knauff Performance Plus Plasterboard. Boards are tapered edge so im thinking i could joint it with an external filler but whats the finish to use to plaster it? Id like a smooth finish

It will be coated in masonry paint for protection but im assuming a Thistle multi finish wouldn't be suitable

Any ideas?? Ta
 
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