[header] How to repair a cracked surfboard [title] Clean the board and let it dry overnight. [step] Wipe the board down with a damp cloth to remove wax, salt, and sand. Use a cotton swab to clean out the crack, and let the board dry overnight for at least 6 hours. 
Before you begin working, squeeze the crack to make sure no water leaks out. [substeps] If the crack is still wet, or the board feels heavier in that area, allow it to dry for another 1-2 days before beginning your repairs.