Simple Answer:
Like a synthetic
wood / plaster.
It is not a
cheap plastic really looks like plaster but is lite weight and easy to
install.
They come primed and need to be painted.
Interior &
Exterior use.
ArchPolymerTM
meets class A fire rating only when it is on special order
to have the
fire retardant put into the material mix or fire barrier primer
can be
applied in 3 coats. This is a requirement in some jurisdictions or
commercial
buildings such as offices or places of worship.
ArchPolymerTM
is the best material to use exterior as it is water
rot, and
insect resistant.