With some advise from Paul etc at easycomposits on how to make a proper over along with buying all the parts he recommended I decided due to lazyness to ignore it and make a pathetic oven that consisted of 100mm kingspan on 3 sides and top of the tub and then point my very powerful space heater into the over (but not directly spat the part).... Managed to get it to a constant 60+ degc for over 6 hrs and it came out the mould better than any other large part I have made... I'm definatelly sold on doing a proper post cure.

For the vacuum sealing issue on large parts, what mil bag are you using?

Must admit I don't really know how much materials I use as I don't monitor it and just buy more as I run out :-)

What do you do with your moulds after you're done with them Andy? I can't bring myself to make my bonnet, boot and fenders because I don't know where I would store the moulds afterwards!

Basically I had a cheap paint job done on the original Tub and lacquered the roof myself in the garage... the mould came off the roof perfectly and easily, however the bits Id had painted all reacted and stuck itself to the mould and was a nightmare to remove and took me around 40hrs to clean it up ready for a pull... not good.