I've shared this a few times, can't say enough how much I love this kit. I have kayaks with holes and all kinds of broken plastic stuff I've fixed. Here's my experience repairing a sea doo spark. I have to agree with another comment, the scratches aren't too bad. Given the spark is plastic, it's nice to have options when the ding comes. I'm hoping the correct heat setting doesn't impact the integrity of the plastic. I think sun damage is a big deal for these boats. Dry brittle plastic is doomed. Keep em covered.
6 inch crack in the hull near the bow
So we fixed the seadoo crack a few weeks ago and it is holding up with no issues. I'm disappointed the dealers (in my area) seem to have no knowledge of this option. The pictures are ordered 1-4, in the order of the repair. We did not opt to take the top off. If this doesn't hold, we'll go that route. The weld felt like the material is one piece again. This is not glue or epoxy that's going to come out. Just drilled holes on both ends (stop the crack) of the crack and used a sharp drill bit to make a small groove in the crack. There's also a method to put a stainless mesh backing in the weld to make it even stronger. The welder has adjustable heat so you are at the right temp with the plastic. Once we were done we sanded to rough it up and then used a small flame to glaze. It turned out pretty darn good. You can't really tell there was an issue. If you repair it from the inside, you can make it look even better (see videos). From the inside you can add all kinds of reinforcement. In my opinion, a kit like this is awesome for all kinds of kayak, and plastic repairs. I'm loving it.
Got a plastic welder kit here and it worked very well. $180
Nice training videos from the tool maker
If you look inside the bow of the spark there's no flotation. Someone posted that it's near the rear of the vessel (engine compartment). If seadoo could reinforce the bow with flotation (spray foam) or honeycomb components, a front impact would be minimized. Now that we have this plastic welding kit and a little confidence, repairing smaller cracks and such really should be no big deal.
The dealer estimate was 4k to repair this (hull replacement). We spent 200 and have a kit to fix other stuff. We would have gladly paid $500 to have an expert pull the top and repair it. It would be a good idea for the dealers to sell the kits at least.