First, you gotta let the board dry out completely, which can take a few days. Then, grab some coarse-grit sandpaper and rough up the area around the ding, making sure to feather the edges of the existing glass. Clean out any loose foam or old resin. Wipe it down with acetone to get rid of all wax, oil, and dust—this is crucial for the new resin to stick. A clean, dry, and rough surface is key. If you skip this, your patch will just pop right off after a few waves.