De-lamination on your board generally occurs when moister has gotten into the surfboard and then been exposed to extreme heat (i.e. left in the back of the car, on the roof of your car or on the beach all day) and the fiber-glass has lifted from the foam core, usually in large air bubbles. That is why it is crucial to fix up your dings as soon as they occur to prevent De-lamination from happening, which is a much bigger job to repair. At the beginning of this tutorial I'll walk you through everything you'll need to prepare and have on hand for this repair.