Yes. Make sure to use Exterior Wood Cleaner before the application of 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 semi-transparent finish. This means spots where the old Hybrid Wood Protector coating is still present, these may be visible through DuroGrit. For aesthetic reasons it may be better to completely remove residual Hybrid Wood Protector.