weatherproof perspex?

[crisgal]

i run a small pre-school and we would love a permanent whiteboard, on the wall,in our outdoor play area.
As I can't find one anywhere, i thought about buying a sheet of white perspex, or similar.
I have no idea what kind of plastic it should be. googling wasn't much help as there are so many different types!
it needs to be compatable with write on-wipe off markers, be weatherproof and be light enough to screw to the wall.
Does such a material exist? Will I find it down my local B and Q or would it be a specialist I need? I would appreciate any advice given, thank you

[crisgal]

.and in which catergory should i put the question???

[ChuckFickens]

just get a norma wall mount whiteboard

They are made of stuff that won't care too much about being outside (plastic and aluminium) and should last years (not sure about the whiteboard markers in the rain though)

[chas2008]

if you cant find white perspex try clear and paint/spray the reverse side white it will show through and look as good..probably easier and cheaper,