Hi! That would be about 15 min between each coats. I think the 3 weeks period was long enough, I read that preferably 72 hours is required for complet curing, and some modeller on YT don't touch it for a week...

So I was doing some thinking last night, I came to the conclusion that I sprayed to thick and the laquer soaked the tape, and bonded the adhesive to the top clear coat... I will do some tests, I really think that is the only reason, and I remember my mix to be very generous on the thinner ratio.