i wasn't happy with the casting finish of the bowls, so i deburred them and slapped a bit of duco on them too
allow the bits to dry for a minimum of a day then it's all into the oven.
i've refined the baking method since last time.
it's just 10 minutes in the oven at the lowest possible temperature,
then turn the oven off and let the bits cool overnight (preferably in the oven if you're not married).
if it's a hot day, you could just leave them out in the sun for the day
then next day is 15 mins on/ 15 mins off for 3 or 4 cycles at 50-70 degrees C.
leave the bits in the oven for the cool down cycles.
cool the bits completely, then back in the oven and gradually increase the temp until you get a slight burning smell, then back off a bit.
the paint's resistance to heat will increase with each cycle.
keep increasing until you get it stable at 100 degrees C.