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Karen,

Eggs that have hairline cracks in them are easy to repair. A thin coating of Elmer’s glue over the crack will work very well. If you do not have Elmer’s glue you can use New Skin or even nail polish. Any time there is a crack in the egg there is the risk that the egg will become infected with bacteria or fungus. However, if there are no other problems with the egg, chances are good that it will hatch if the crack is minor.

Even eggs with major damage can and do hatch when repaired, if the damage does not extend into the membrane and the egg is not addled. The chances of a live hatch diminish the more severe the damage. With eggs that have major damage you can create a patch layering sterile gauze and glue. Whenever this type of repair is required, the egg will not hatch without assistance.

You mentioned incubating your eggs at 100º F. Temperature and humidity control is very important. Normal incubation temperature for parrot eggs is 99.5º F. Hatcher temperature is 98.5º F. When chicks are moved from the hatcher to the brooder the temperature is 97.5º F. I recommend reading Parrot Incubation Procedures by Rick Jordan. The book is nicely organized, well written and easy to understand.