Simply apply & heat to fill cracks and chips on enamel dials.
Before applying the dial enamel to the chipped and cracked areas you need to clean the dial as well as possible. Soap, water and a soft brush is an old time method. Others will now use an ultrasonic cleaner will a jewelry cleaning solution, which is different than watch cleaner used on the movement parts. After cleaning the dirt out of small cracks you might not notice them as much or at all. When the dial is fully cleaned, completely dried, oil and dust free you are now ready to apply the dial enamel material. Place a small amount over the crack or chipped area where you see the metal showing. You want to use just enough to fill the area when the enamel is melted. To heat the enamel over the low heat flame of an alcohol lamp until the enamel begins to warm, soon it will completely flow and fill the cracks and chipped places. You want to remove the dial from the heat before the enamel spreads to areas that you do not need or want it to flow. Excess dial enamel should then be removed and a new shape razor blade is recommended for the removal of excess material.
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