Generally... if you have an actual hole in the bottom... I don't even recommend fixing it. Contact someone who sells used parts, and get a hull. Most of the time, they go VERY cheap, or even free, since people don't normally buy them. When I part out a ski, it actually cost me $35 to drop a hull off at the local land fill.
I don't part out skis very often... but when I do... if someone wants the hull... I normally just give it to them. Even on eBay... hulls only go for $100 with a clean title.