very interesting but the way i see it if i have a oven working 16 hours on the weekend alone means i have lots of powdercoating to do .
with an oven big enough to do bike frames i am sure to make a minimum of 50 $ an hour (and that is really a minimum that an oven like that should produce)
so 50 X 16 hours = 800 $ minimum so i don t really see why go through all that to save $17.28 out of 800$
this represents about 2% of the money you can make in your weekend.
i think that spending less than 20$ to make a minimum of 800$ is nothing ,
it will cost much mure in time just to build such oven.
of course this is just my opinion