pardon me, what do you mean with why I didnt grip my paint?
Only wipe with cloth and tissue before start to paint it, to wipe the dust and other dirt. I am waiting a day to dry, because my model before this have a paint fingerprints,lol.
but it make sense though. 
chances your paint was too dry by the time they reached the model surface. (too far, or spray can pressure uneven,
no one said spray can was supposed to work
Just to interject a little more into the conversation, it seems an interesting dilemma. My first thought was a primer coat should have been applied initially. I always prime my models, always. That being said, I never "degrease" my models prior to paint, either. I've been building seriously/professionally for about 20 years and I have never, ever cleaned a model before applying paint. I always spray my models with air from my airbrush immeiately before painting - just to chase away those little dust specks. But I have never wiped down or doused my models with alcohol, etc.
I do wonder, however, if an extended drying period (maybe many, many days) was needed on the model in question, given Ulung's location. I have to feel humidity had to have affected the paint in some way as I routinuely use Tamiya lacquers from the can for small jobs and have never had any issues such as we are speaking of.
Interesting .....
Kirchoff
@ Mauro: I never clean the model with alcohol before. Is clean the model with alcohol wont damage the plastic? If so, next time I will combine everything
I will clean the model with alcohol, put the primer, wait for dry with more time, and so on.
My opinion is this -
It was caused by finger grease,
Wheels and the edges of mudguards are classic areas for this problem, because when you hold, move, pick up, and handle models you tend touch these area's.
Just to interject a little more into the conversation, it seems an interesting dilemma. My first thought was a primer coat should have been applied initially. I always prime my models, always. That being said, I never "degrease" my models prior to paint, either. I've been building seriously/professionally for about 20 years and I have never, ever cleaned a model before applying paint. I always spray my models with air from my airbrush immeiately before painting - just to chase away those little dust specks. But I have never wiped down or doused my models with alcohol, etc.
I do wonder, however, if an extended drying period (maybe many, many days) was needed on the model in question, given Ulung's location. I have to feel humidity had to have affected the paint in some way as I routinuely use Tamiya lacquers from the can for small jobs and have never had any issues such as we are speaking of.
Interesting .....
Kirchoff
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