Sentence:  If you surf regularly, then you're going to ding your board. Here's a rough guide on how to repair them... If the <WSD>ding</WSD> is on the rail, run tape across the <WSD>ding</WSD> conforming to the rail curve, leaving a gap to pour in resin and make sure it is sealed to prevent resin escaping and forming dribbles. 
Meaning of the word marked with <WSD> tags:  Very minor damage, a small dent or chip.