How to fix a fondant cake defect?

To fix a fondant cake defect, first assess the issue, such as cracks, tears, or uneven surfaces. For cracks, gently smooth the area with a bit of vegetable shortening or water, then reapply a thin layer of fondant if necessary. For tears, you can patch them with a piece of fondant that matches the color and texture. If the surface is uneven, use a fondant smoother to even it out, or lightly roll the fondant to make it more pliable.