To fix the larger crack, I started by sanding the paint off in the damaged area, tapering the sanding a bit so I cut a valley along the fracture. I did this on both the inside and outside of the panel.
I used a 2" sanding disk in my air-powered angle dir grinder because it's fast and small, but any sander would be just fine, including hand sanding. Inside:
Because the factory hardtop is so thin, sanding a valley on the inside and outside of the crack resulted in sanding all the way through. Not a problem though. Outside:
Since the fracture has deformed the panel a bit, I'll apply a layer of fiberglass to the outside first and then I'll straighten it by clamping a board to the area with a layer of waxed paper between the board and the fiberglass to the board doesn't get stuck to the hardtop. After the fiberglass has cured the clamp will be removed.
On the outside, a layer of fiberglass mat has been applied and soaked with SMC-compatible resin:
Then the board is clamped in place and a piece of fiberglass mat is applied on the inside, also with SMC-compatible resin.
When I'm in the process of bonding the flanges to the panel, I'll be using white-tinted resin, so I'll cover up the repair in the inside with another 2 layers of fiberglass; the extra layers will reinforce the areas and the white tint will hide the repair so no touch-up is required. For now, the single layer of mat will stabilize the area until the final layers can be applied.
Once cured, the clamped board and waxed paper is removed:
In the photo above the area hasn't be sanded smooth yet - I'll apply some ordinary body filler before sanding to take care of any imperfections in the surface. Because the repair area has a layer of SMC-compatible resin on it, ordinary body filler can be used. Once sanded smooth, MOPAR hardtop paint will be applied to hide the repair.