quite some years ago I used to by electronic magazines and some usefull
tips where given in them.
anyway one tip I remember which I want to do now but have forgotten the
process?
The process involved dipping aluminium panels in caustic soda for a few
minutes whereby it gave the surface/facia a very hard resiliant
surface,almost none scratchable.

Does anyone know the strenght of the formula and time to keep it in the
caustic soda?

Thanks
--
Sir Benjamin Middlethwaite