The red gunge on the gargant is the basecoat leftover from the previous owner (and apparantly gallons of superglue!). I used white spirit and nail varnish remover to get rid of most of it but the corners and nooks have proved difficult, as you can see. Thankfully, the gunfortresses only had a white undercoat, which will be must easier to paint over.
The other thing I've done (inbetween holidays) is to prepare some Ork nobz in mega-armour. This was the first attempt at pinning metal minis and it seems to have been successful - the proof will be once I've painted and then glued them. I plan to use this technique with other 'heavy' metal minis (old chaos knights etc.).
I'm now really looking forward to getting my hands on the new Planetary Empires set - 40k campaigns ahoy!