Any executor who fails to pay over any money to the Master or to any other person or to deposit it in any banking account under section twenty-eight when required by or under this Act to do so, or who uses or knowingly permits any co-executor to use any property in the estate except for the benefit of the estate, shall pay into the estate an amount equal to double the amount which he has so failed to pay over or to deposit or to double the value of the property so used: Provided that the Master may, on good cause shown, exempt any executor, in whole or in part, from any liability which he may have incurred under this section.