Hello Richard,
Sorry to hear about the problem with the "sprung" window.
I'm sure you will already have thought that heat is probably the only
"treatment". The problem is that both the Redox and the Perspex will soften.
The question as I see it is which softens first?
I haven't tried it but wonder if this might work. Cut a piece of metal
(ally, 1/8th thick, e.g.) to the shape of the area affected and a piece of
wood (ply e.g.) the same. Take another chunk of wood (2"x1"e.g.) to bridge
across the inside corner of the door and, using a G cramp, clamp the whole
thing together . With a hair drier, warm up the door-frame area where the
window has lifted. The metal should (hopefully) act as a heat sink to
protect the window while the Redox should (again, hopefully) soften and
allow the Perspex to re-seat.
Just a thought. It might work! (Before you try it, would you please delete
this email and my address in case it doesn't!)
Best regards,
Ron Jones.
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