stay away from the spackle
You may want to have a deep gash like that fixed professionally but it may cost you some coin and time away from your board. If you DIY check what kind of board you have (poly or epoxy). If you have an epoxy, do not use polyester resin to fix that hole. It will melt the foam. You need the proper type of resin and resin filler powder to fill a deep hole. Mix the filler with laminating resin and catalyst and it turns the resin into a thick paste that will fill the hole but not add too much weight, such as if you just poured resin into the hole. After the hole is filled and the resin cures, go ahead and put a layer of cloth saturated with catalyzed lam resin on it. After it cures again, finish up by brushing a coat of catalyzed sanding resin on it. Let that cure then sand smooth. If you're using a resin in a ding repair kit don't worry about the dfferent resins (laminating vs. sanding) use what they give you. Just make sure to sand it roughly between coats.
stay away from the spackle II
I've seen ding repairs with spackle and man, it ain't pretty. You may find your board on the road to beaterville in a hurry. Not to say it can't work as a filler in a pinch.
Suncure is good stuff but I find it works best on small dings. Beats messing with too many toxic chemicals, though. For a 2" x 1" hole you will probably need the bigger size tube.