The term "Top" in plastering means the finish or "top" coat. It needs to be stiff and thick so it doesn't run when applied to the surface.
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A note at the bottom of the staff does not have a higher than a note at the top of the staff. As notes go up the staff, they are higher.
top
In traditional Western music notation, the fifth line is at the top of the staff. The staff consists of five lines and four spaces, with the lines representing pitches. The bottom line is typically the first line from the bottom, and the top line is the fifth line from the bottom.
The correct placement of the F sharp note on the staff is on the top line of the staff.
Gypsum plaster (plaster of Paris) ( CaSO4·½H2O ) A large gypsum deposit at Montmartre in Paris led gypsum plaster to be commonly known as "plaster of Paris"
plaster.
the sankofa bird
Managerial staff at the top of an organisation.
The papal staff is called a ferula. It is a staff which is topped by a cross. Bishops carry a staff with a curved top which is called a crozier.
The finish plaster is normally white all the way through. It sounds like you are dealing with a pool that has been replastered by the method of putting a "brown coat"/"scratch coat" (the gray plaster you noted) over the original finish plaster surface, and a new finish coat of white plaster on top of that. The scratch coat more like a thin concrete than plaster (doesn't have the white marble dust in it) and is used to get a better bond to the old surface.
one on the bottom of the staff are valves 1 and 2 while the one at the top of the staff is open