Griots glass sealant performs well but durability was 3 months at best.
From what i’ve read flyby30 is great and very hydrophobic but 3-6 months durability. Read flyby40 is not quit as good but 1-2 years durability.
I went gtechniq g1.
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I took a good look at my coating last night, flyby30. I believe there is a drop in performance. Its close to 4mths now. When it warms up i will put another layer over it. Lots left.