Can i use duct tape to temporarily fix my surf board cracks?

Duct tape is water permeable. If you are absolutely in a pinch use a sticker. I hate to admit but I have several boards with sticker patches, and I can actually do ding repair..I'm just lazy.

Fix the ding correctly with resin and fiberglass (unless its epoxy) otherwise you are going to reck your board. The Surfboard Man http://www.thesurfboardman.com/

Don't bother with the Duct Tape - it leaks anyway, and worse, the gummy part of the tape makes sanding the area later much more difficult. Use the sun-cure as the first guy said, but let the board and wet foam dry first.

ok, you should buy sun cure, super glue will NOT DO IT!

really for short periods its better than nothing. i dinged the end of my long board the day before a school contest and used duct tape for the day. if you wax the edge of the duct tape it keeps it flatter to your board and lets in a little less water.

Dude yeah totally, but if your looking for another quick fix putting a **** load of wax could help also but again only temporarily, make sure you get cold water if the waters cold and warm water if its warm!

If I were you, I'd look into getting a new board as soon as possible. But if u don't feel like it, don't have time, or just don't want to, duct tape might hold it for a while.