I have recently had my kitchen ceiling plastered, they used boards and two coats of plaster, although a week on and completely dry there are definite lines along the ceiling.
i have had the guy come back out and he says its only water lines, is he correct or could there be another problem??
As long as he's used fibre tape on the joins then it should be fine, there shouldnt be any lines anywhere but occasionally you will see slight lines where the boards meet, especially if he's overboarded the ceiling, if these lines are everywhere then hes not done the job 100%, if he'd just skimmed over the original ceiling then thats a different story but he's skimmed over a plasterboarded one and the finish should be near perfect.
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