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I would try JB Weld as suggested to fill that big of a hole, and I also would finish the inside of a white procelain sink off with some white Appliance Touch-Up. It comes in little bottles with a cap brush similar to nail polish (available at most appliance dealers).
You dry the spot with a hair dryer on high, sand any rust off, brush on the Touch-Up, clean up the edges with a Q-tip dipped in acetone (nail polish remover), and let it dry overnight. It drys hard as a rock like appliance enamel, but it can shrink a bit, so you might have to apply it twice for a smoother finish.
I've been using it for years on dents, dings and small holes and cracks on my washer and dryer enamel, fiberglas shower/tub units, sinks, etc.
Good Luck!
Mike
You dry the spot with a hair dryer on high, sand any rust off, brush on the Touch-Up, clean up the edges with a Q-tip dipped in acetone (nail polish remover), and let it dry overnight. It drys hard as a rock like appliance enamel, but it can shrink a bit, so you might have to apply it twice for a smoother finish.
I've been using it for years on dents, dings and small holes and cracks on my washer and dryer enamel, fiberglas shower/tub units, sinks, etc.
Good Luck!
Mike
