there's no fixing a scratch that gets to the base layer. Time to take it to the paint shop.
I've been using Finish Kare FX100 and #425 which from what Ive noticed so far, seems to work with every detailing product on the planet. And the prices are great for the quantity you get. I've been detailing a looong time this stuff is a god send for time efficiency. With autocross/track season coming up I'll be using it plenty. Nothing more I hate then spending two hours to clean the car and then doing it all over again Sunday night after an event.
https://986forum.com/forums/finishkareusa.com