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I purchased a cupola from a local coppersmith and was looking to age the copper top to a green patina. The cupola is a 36″x 65″ bell shape. How much Jax Green Patina is needed for this cupola? Also does this process compromise the copper in any way?

We use the figure 100 square feet per gallon of product. We would not worry about the copper, as Jax Products create oxides on the surface of the copper and will have no negative, long term effects. We would also consider the use of one of the Jax Darkeners (our preference would be Jax Brown-Black) before you apply the Jax Green Patina. It will be far more authentic than just applying the green on top of virgin copper.