Back scene backing board

[Steve M]

That would probably do the job John.

I think to get an even and consistent bend I would make some kind of box that I could slide the ply into then fill it with steam from either a wallpaper stripper or a steam cleaner, once steamed it can be removed and formed to shape. It would ‘set’ as it cooled and dried - I think that’s how commercial operations handle it.

[footplate1947]

Thanks Steve wil give it a go...............John

[Maz066]

What about plastic corrugated flute board. It's light, can be joined with gaffer tape and bend through 90 degrees

[footplate1947]

That is another idea to put into the pot and think about. That post got pushed off the new post board even before I saw the answer. Most odd. Wonder how that happened. ..........John

[AustralianLMS]

Well it is now done. And it was very successful.

I have 3 mm MDF at 90º. I scored the MDF with a Stanley knife and then took away a millimetre along the score line with a chisel. I butchered a plastic A4 folder for the plastic sheet and it fits beautifully. A little smear of PVA and it was all done.

Thanks for the suggestions.