Hello friends. I have a tip for you if you have purchased a Chinese made polystyrene model. Many of the current models that are on the store shelves these days are made in China. Of course, the quality contol is fairly poor inasmuch as the Chinese just want to churn out as much product as they can without any concern how well made they are. Plenty of "flash" to trim off but that can be dealt with ok. Here's the big problem - Chinese made polystrene models have huge traces of hydralic oil on them from the molding process. Their moldng presses are rudimentary at best. So, paint simply wont adhere very well with the oil on the pieces. Here's what you should do. Wash all of the parts in a warm bath with a strong detergent like Dawn or any other dishwashing detergent. You'll be glad you did. I do this with all models not just Chinese made ones. Never have any paint adhereance problems. But the Chinese models are absolutely the worst with oil issues.