I did try a Stanley knife and while it scored the surface I wasn't
confident it wouldn't be "pinched" as the blade got deeper.
This is the stuff:
Oh, 'cement fibreboard', not 'pin / notice board fibreboard' (what
many people might think if you just say 'fiberboard' and without any
context of the suggestion of usage).
I've used an old panel saw and jigsaw for curves.
Cheers, T i m
Sorry for the confusion.
It seems that cement fibreboard blades for circular saws have few teeth,
on the basis there is less dust.
I will probably use a conventional TCT blade making sure I'm upwind from
the dust cloud.
I think that would probably be OK. Don't use too much force. The thinner
6mm stuff is OK with a hardpoint panel saw, but I guess would be harder
work with 12 mm. You could probably score and snap 6mm with care and a
suitable tool (TCT manual tile cutter would be better than Stanley
knife), I wouldn't try that with 12mm.
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