Cons : After all the Brillo scrubbing and cleaning I did - the product did not work. Now the piece looks awful. Sorry I used this. Splotchy, seems watery, not strong enough, or ineffective chemical
Cons : We found we have to rub our zinc frames thoroughly with steel wool and then generously wash the entire piece before applying patina. We start with solder patina on the solder lines first and then finish with the zinc patina on the frames. Let it dry good before waxing. Extra long process but if piece is cleaned well the patina works great. We apply with a white nylon pad and rub patina in well. It does have a mind of its own at times.
Cons : After a thorough preparation with the green scratchy pad the patina still did not turn the zinc black. It seemed diluted and left the zinc border patchy with a whitish haze.