Exposed car port - painting ceiling

SplanK

Hi,
We have a 3.5m x 6m car port. 2 sides are brick, one side partly exposed (there is a garage at the other end with approx. 60cm air gap between), and the other fully exposed. The ceiling part of the car port being plasterboard (above is essentially a fully tiled roof with an attic space).

The ceiling has been previously painted, probably when the house was built 20 years ago and its well over due a refresh.

However, I'm conflicted as to what paint to use. My initial thought was to go straight for a mid range indoor silk paint, but after some thought, with it being outside, exposed to cold temperatures, damp air and the possible splash of water when either washing the car or driving rain, I wonder if there is a more suitable paint (ideally, one that doesn't cost the earth!)?

SplanK

Did a big more digging last night. It would appear that masonry paint is the go to paint here and some of it appears to be glorified emulsion with additives..

I am keeping an eye on Dulux Weathersheild which seems to fit well with my needs.

Grenage

I used Weathershield trade for my soffits and barge-boards; it's very good stuff, but it wasn't cheap.