If you can make do with 99 deg. C.. why not mould in silicone hose .. then run hot water through the mould ..

No fire-danger -- the temperature can be quite precisely controlled  (Large tank of water, high capacity water pump, PID controlled heating of the water)

On alu-moulds, use heated oil .. 

I just use polythene bags of hot water  and old fleece blankets for insulation -- Not to post cure but to speed up the primary cure ..  Could be used for post-cure as well --

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Postcuring to reasonable temperatures can be done with a simple electric blanket and duvet for insulation. Modern blankets have a temperature safety cut out so should not get too hot. However, fire safety is a priority and we recommend not to leave it unsupervised just incase something were to go wrong or the blanket heating combined with exotherming of the resin is enough to set it alight.

In home experimentation, in a 20C room I have seen 60C on the mould surface of a medium sized mould wrapped in a double heated blanket and double duvet, so useful temperatures can be achieved. Even in the garage where the temperature was hovering at 10-15C I would easily get it to 40C and above so for the cost can be a worth while "DIY" method of postcuring without an oven.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Another vote for bed hot blanket and an aloof double duvet

I wouldn't. You want to keep in mind that PID controllers work by simply switching the heating elements on and off. The heating elements themselves still run at full power for the time they are on and can get very very hot. In an oven, blanket or aluminium mould this is OK, but if you had the heaters moulded into fibreglass then I think you would damage the resin around the elements. 

I will try this, I have ordered a PID controller, solidstate relay, heating pad and a bunch of Type C thermocouples. 

I use an electric blanket and a duvet to post cure large parts.  Works fairly well.

That's how a lot of pre-preg boat hulls and aeroplane bodies are cured, so they do work. Quite a bit more involved than an oven though I think. 

I looking for post cure options. I want to make parts as large as a car hood, but I dont want to build a big oven.