Do you think that would also apply to topping Four star with a nuba after 6 hours?
Yes I do.
The manufacture is probably indicating that the sealant is cured after 6 hours and then permissible to over coat. If you're still uneasy then wait a little longer, an additional few hours isn't all that long..
I believe the addition of Polycharger likely reduced the typical wait time. I have done a second layer after 4-5 hours with no ill effects. I think it also depends on environment and weather.
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