Very little Krytox goes a long way. Just put it on your finger and use sparingly on the gaskets.
The one drawback, if you do any off-roading, dirt will collect on the gasket where the edge of the tailgate rests and will grind into your paint. Clean the dirt off often.
https://www.ford.com/product/sunscreen-uvs100-custom-p2825785242?gmcid=marketplace-gs-cta-accessories
While the price seems higher than I remember, it is a nice shade that works well.