How long do DIY ceramic coatings actually last?

Sprays generally deliver weeks to a few months of hydrophobic protection per application. Dedicated coatings like GYEON MOHS and CARPRO CQUARTZ UK 3.0 are marketed for multiple years, while graphene-spray products like Adam's quote 18+ months. Real-world longevity depends heavily on prep, climate, and wash habits, and the data we have doesn't include independent durability testing to confirm manufacturer claims.