i've got to price a ceiling job up fellas.its a meeting hall ceiling,had water damage.total size is 135sqm,30sqm of new board has been introduced to replace damaged board.rest of the ceiling is artex.gotta 2 coat with multi.how many spreads?was thinking at least 4 with 2 labourers?they are having scaffolders build a false floor for ease of working height as it is 10ft.im just pricing for plastering labour and materials.25 bags of finish? any advice(sensible).