Solid plaster is an art and requires a highly specialised set of skills. The cement mix is an indoor and out door product, an artist will call it mud.
Mixing mud your ratio should be 4 parts washed sand, 1 part cement water-proof/salt retarder. Opt for a finish coat known as white set. This is hard plaster mixed with lime.
What is Matching Colour and Texture?
Matching a finish requires a practicable approach. The purpose of this is to break visual impact. Alinement Group can uniquely incorporate this by adding a physical joint, a door/window, downpipe or other similar separating materials where possible.
The owner or agent at the time of construction specifies construction that does not allow for movement. Cracking will not be a defect.