Nothing will fix chalky gel. But the good news is there's good gel just under that chalk.
I did a "barn find" this summer. It sat uncoverred in a grove of trees for almost 20 years. My local body shop supply set me up with these 6" foam backed discs in 1000, 2000 and 4000 grit. I put them on my DA with a 3M foam backer disc- velcro on both sides. This prevents digging in on sharp corners. I started with the 1000 and the spray bottle. It cut fast right until the chalk was gone, so it was easy to tell when to move on. I did the angles and inside corners with a disc off the DA, folded in half. Same with the 2k. The 4k left a finish that was almost perfect. I hit it with 3M Imperial lightly and finished with Finesse-It. Then I did a couple coats of Collinite.
If you want to skip all that and don't mind regular re-application, use the Collinite paste. You might get close to a month of Ok shine on dead gel.
The 3M Ultra Perf is good wax too, But about twice the cost Imperial and Ultra are from their marine line and probably not available locally.