How many square inches will 4oz of PnP solution cover?

[Hewhois]

Greetings!

I realize this may be a hard question to answer with exact numbers, I'm just looking for a general guideline.

Approximately, how many square inches of Sliver Plating at a "normal" thickness will a 4oz bottle of PnP Silver Solution take care of? How about the Gold solutions (normal, fast18k, fast24k)?

The specific applications will be touch ups of worn off silver plating on older and vintage musical instruments. Also, silver plating the lip plate on nickel plated flutes, and gold plating the lip plate on silver flutes. Along with silver/gold plating of mouthpieces for trumpets/trombones/Saxophones/etc. Redoing the gold wash on the inside of bells. And so on.

Any and all guidance welcome thanks!

--Chris

[Hewhois]

No thoughts a'tall?