Thanks for the welcome MississippiMan!
The Home Cinema is located up in the loft/attic, with decor complete (ideally not the correct way round to do things), and we will be doing all our watching in complete darkness.
The Ceiling is a dark coffee brown, and as it stands we don't notice any reflections from the walls with the BOC sreen. I will hopefully post up some photos of how it currently looks. The walls are a lighter shade of brown, but are angled downwards, and again don't seem to be the source of any reflections.
The Projector throw is 4.8m, and the distance from the front row of seats (head position) to the screen is 4.2m. The screen size (picture size) is 1.95m x 3.5m.
The reason I was preferring rolling, was because the room is complete in terms of carpet laid, walls painted etc. If spraying will dramatically improve results, then I'll go with that and just make sure everything is covered up.
I'm quite impressed (as a newbie) with how the BOC looks, but I feel it could do with more "pop"; there seems to be that something missing which I'm hoping I'll be able to achieve with a screen paint.
Up until now I was considering a Black Widow screen, however that appears more geared to handling ambient light, and may not be the best option for a completely dark room.
Looking forward to your advice!