[Tractionist]

DavidG4EBT seems to have done a lot of these - I've done three or four too. Whenever the case is in pieces, David tends to reinforce the edges of the segments with tiny pins prior to re-cementing them back together. However, in the instance of your crack (as opposed to a total 'parting of the ways') I'd first clean it up with a drop or two of bleach and/or IPA, and then run some superglue in to it.

However, I would counsel that these cases are nigh impossible to make an invisible repair on. Indeed, even when intact - they seem to yellow and lose their lustre with age. I suspect that they are manufactured out of some form of catalin. In any event, many of us have had to resort to spraying the cabinets with an appropriate paint and colour subsequent to a crack repair.

Hope this helps ....