Stephen wrote:
Hello,

I don't think I held the steamer too long in one place as three walls
escaped without injury but the fourth wall had a few areas where the
plaster fell off. It's only the top layer of plaster that fell off,
leaving a very sandy render underneath.

The sandy render is probably the reason why the plaster came off.

Did you use anything like dilute PVA to seal the sandy render?

Guy
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Guy Dawson I.T. Manager Crossflight Ltd