Popcorn pen is a pen with fun puffy paint. Just squeeze out paint and blow it with hair dryer to have the 3D popcorn effect.
I have tested yesterday, it really can "pop", but due to my hair dryer contrains. I need to iron behind my paper 1st before I using the hair dryer. Sometimes successfully pop out. Sometimes my hair dryer will automatically cut off becoz too high.
Too bad my oven is at my friend house. Maybe I should oven it next time.