Noticed the crack when back at home. Nothing irregular in riding, etc. do all the sparks come discolored? Do you work for seadoo since you defend them so well?
No, I don't.
If you came on here and said, "We accidentally nudged it into the back of the trailer and cracked the hull - what should we do?", there are people on this site who would be sympathetic, offer advice and tell you what to do next in terms of talking to your dealer and getting the damage repaired or the hull replaced.
Saying "We did nothing, it cracked by magic" makes me less sympathetic.
And your post comes on the back of others by new members in recent days starting similar new threads instead of posting in existing ones, where it could ALMOST seem to be a coordinated effort to paint the Spark as plagued with problems.
Plenty of us have owned these machines for months, with tens of hours on them , with no problems.
Yet a lot of first time posters seem to have experienced a Sparkpocalypse which was in no way, absolutely not, anything to do with them.
You might say it's natural, if someone has an issue, that they turn to the web and wind up on a site like this. But the tone of these first time posts is often the same.
If you have a genuine issue, I feel real sorry for you and hope you get back on the water soon. The Sparks are a fantastic machine and heaps of fun.
But when you take it back to your dealer, bear in mind they will be looking for impact damage and they will most likely recognise it if they see it.