Check both the Grainger and McMaster Carr listings. They both have
fairly reasonably priced ($90- $400) temperature controlers that can be
programed with ramp rates and hold times. Add in a solid state relay
and a thermocouple (another $40) and you can build a nice curing oven.
They are simple to set up and use. Eurotherm is one brand name that I
remember from my lab days........ http://www.eurotherm.com/
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Leon McAtee
Building bents for kids and experimenting with my first bent trike