fresh
cracked, crumbling, peeling

chunk
Each blow of the hammer removed a great chunk of plaster.

apply
Apply the plaster evenly.

come off (sth), fall off (sth), peel off (sth)
Plaster was peeling off the ceiling.

cast
A plaster cast of Madame Fournier stood in the artist's studio.

wall

sticking

put on
peel off, take off

cast
Her broken leg was put in a plaster cast.

in plaster
Your arm will have to be in plaster for at least six weeks.