Widshield\backlight installation

You can reuse the gaskets if you spend the time needed to clean them.
The black urathane sealant isn't easy to clean up. A heat gun will soften it on the body (no heat on the gasket) and some solvents will cut it slowly. Dont soak the gaskets in chemicals such as kerosene either! They will grow ! The sealant also needs an ambient temp of atleast 70 degrees when installing.
Hope this helps