I'm not a repair expert, but I fixed a couple of dings on my board not too long ago and this is what I did..
depends where it is really but if it's a crack suncure should be fine. it depends on how big the crack is but I'd get a toothpick or a stanley knife, whatever fits best and caaaareeefullllyyy see if you can dig out the wax- just be careful not to damage the foam any more than it is already.
if it's just a sliver don't worry about doing this, but if it's a bigger crack that's damaged the surface of the board then it may be a good idea to cut out the damaged bit with a stanley knife, then rough it up with some sandpaper and do the suncure. that might get the wax out too, but as I said, only do that if it's a bigger ding, you don't want to further damage your board, you know? just make sure the foam's had a chance to dry. hope that helped- as I said I'm not an expert but that's how I've worked my dings and the repairs have held up ok
