On 19/06/2020 10:00, Smolley wrote:
I need to cut some glass 4.5mm (a mirror), do I need to score both sides
or just one side. Can I use washing up liquid for lubricant instead of
oil ?

I've cut an old mirror with a normal glass cutter and it was fine- score
the non-silvered side and snap it as normal. I took a bit off the cut
edges to smooth them with a oilstone like you'd use to sharpen a chisel,
IIRC, but it was about 35 years ago. I'd found an old, framed
dressing-table one and cut it square.