Can we apply DuroGrit over Hybrid Wood Protector?

Yes. Make sure to use Exterior Wood Cleaner before the application with DuroGrit. Sanding the layer of Hybrid Wood Protector is not necessary, unless the Hybrid Wood Protector layer is still very present.

Keep in mind that DuroGrit is a transparant finish. This means spots where the old Hybrid Wood Protector coating is still present, will stay visible.