I always assume it starts when you apply it; when you wipe it off you`re removing "excess" product that hasn`t bonded to the paint or otherwise contributed anything and the SG that stays on the paint is already "set".
When I layer the SG on our vehicles *using this assumption* it lasts an incredibly long time, far longer than it coud if each layer was removing the preceding one. I`ve been doing this for years, so I`m pretty confident that I`m not wrong about this
But if you applied the SG *so thick* that it couldn`t really cure "properly" (and I mean goofy-thick), that could change things. So put it on as thinly as you can and you should be fine.
Oh, and I`ve read that a longer cure time (e.g., a week or so) is better than 24 hours. Could be, but again, I`m not experiencing anything that indicates that the 24 hours (after initial application) is insufficient. Still, I always layer some more on after subsequent washes, which is probably a good idea if you`re going for maximum durability.
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