Plasterboard wrong way up

Good evening gents , not long back from doing a quote for a customer . They’ve had a friend /builder in to do the works , he’s studded ceiling & walls celotexed it etc . Problem being he has not only nailed everything his managed to put the boards grey side showing . My question is will this be an issue when coming to skim on it , wasn’t too sure if the backing may come away once the plaster penetrates into it ? Look forward to the replies . Many thanks
[/QUOTEskim it
 
I'm colour blind
shiit all looks the same too me steve (y)
Oh yeah I was going to get you this T-shirt wasn’t I?! Can you remember what it says?

Plasterboard wrong way up
 
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