Re: Gluing perspex.
It used to be called Tensol, when ICI made it. The action is at least partly a solvent one, so it dissolves the acrylic which then resets, leaving a weld rather than a glue joint. If done carefully enough (joint surfaces machined cleanly, no air bubbles trapped in the joint) you can get a completely invisible joint this way.
With experience it's possible to achieve the same effect using pure chemical solvents. I seem to recall that dichloromethane works. I worked for a while in a chemistry lab where the graduate students built really professional looking perspex boxes to cover their laser equipment. But they had easy access to solvents, the experience of colleagues who would help them and, most of all, the knowledge needed to keep themselves safe. I'd hesitate to recommend this approach to anyone who didn't have these things.
Cheers,
GJ
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