[Jewelry making - Article 00953] - Re: [Orchid] Vacuum casting seal problem

[The Doctor]

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    Just before burnout, try rubbing the investment-filled flask (not
    the button end), across sandpaper on a flat surface. A machined
    surface would be the best choice, but use something as flat as you
    can. Check the flask to make sure it has been roughed up around the
    entire rim. That may help you get a better seal. 

James in SoFl


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