What it is: it is manufactured; the vegetable aspect can be wood; the mineral aspect is fluid which is not entirely water and is probably colourless; it is found in the home and the workplace; it is smaller than a toaster; it was invented; it could be associated loosely with fixatives/glues.

What it's not: crisps; anything to do with booze; bigger than a phonebox; a tool; a container; anything to do with weather-forecasting (including barometers); involving sea water; a drink; starting with P; used as a cleaning fluid; a measurement device; linked to vegetal fluid; to do with sport or cooking; alive; something to wear (conventionally); a means of separation; a newspaper; printed paper; involving paper; to do with the arts; medicinal; a fixative or glue; model aeroplane; wood glue; wallpaper paste; polyfilla; playdoh; size; papier maché; plastic laminated card

[Tuj] Sellotape? YES, dagnammit, YES !!!! *rapturous applause*
[Chalky] A sealant? Well, as you can now see, it can be.
The vegetable is wood, cotton or hemp. That's dissolved in alkali to make viscose, then extruded into an acid bath to make cellophane. Rubber resin is applied to the cellophane to make Sellotape (or Scotch Tape or cellophane tape). My confusion over "fixative" was because I thought it meant something to fix one thing to another. Over to you Tuj, and congrats.

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Can I pass this one up? I'm probably not going to be around enough in the coming days - I'm packing & leaving for my second year of uni at present, a little mad (and no guarantee of having Internet at the other end yet...)
Whoever's in next with a good idea can take the baton.