Hi Mike, We do commercial casting, although we are located in
Phoenix, AZ. The problems of pitting and porosity are generally the
result of excess heat. They may be casting at too high a temperature,
especially with the silver, which can be VERY TEMPERMENTAL. Similar
problems can result in wax injection if the wax pot is too hot or the
type of wax isn't appropriate.
If you don't have any luck in the Seattle/Tacoma area, let us know
and we can send you our pricing We'd be happy to help.
Pearl Exotics Trading Company