Plaster does not come away from a wall because it got wet, it comes away because it was not put on correctly in the first place.
There are very little surface's in the construction industry that are not porous and will accept/suck water from the plaster, this process dry's out the plaster at the interface of the two surface's and inhibits adhesion, it is essential to wet out the sub structure to prevent this happening, but due to speed being of the essence in construction this wetting out delays the plaster setting and the application of the second coat, therefore it's omitted to the detriment of it's correct drying process and adhesion to the sub-strata.
There are very little surface's in the construction industry that are not porous and will accept/suck water from the plaster, this process dry's out the plaster at the interface of the two surface's and inhibits adhesion, it is essential to wet out the sub structure to prevent this happening, but due to speed being of the essence in construction this wetting out delays the plaster setting and the application of the second coat, therefore it's omitted to the detriment of it's correct drying process and adhesion to the sub-strata.
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