2020 Scat Pack Plus Pitch Black
I would do it 2 to 4 times a year. I would also use Spray toppers to keep it going.
With the one application, it did last from April to mid winter. It was still beading water in Dec for sure.The OP is only using a "topper". The OP is not using a true ceramic coating... one where you would top it off every few months. It's simply an every day spray on sealant.