Should I be sealing around the base (where stucco meets the hearth) of the oven and around the chimney with the xtrabond ht after the the second stucco coat but before the brick veneer?
I recall a thread where someone had got water inside the oven from around the base.
Sorry for the delayed response, Dave; my work stuff has been cranking up over the past week.
Yes, that would be the way to do it. The stucco is your “real” weatherproofing layer, so that’s what you want to seal. Think of it as the envelope that contains the working parts of your oven. The veneer is decoration, like siding.