I realize this is a reply to a six year-old query, but the question was posed how to paint, or rather, how to get the paint to "stick" on the Maschinen Krieger models. Hasegawa uses an oily release agent on their molds as do all manufacturers, and one would be well-advised to soak the trees in Simple Green, Dawn, or Mr. Clean as I use. I haven't experienced this problem because as a matter of course, I always soak the sprues in a detergent solution an have never had this problem. Also, I prime my parts which gives the surface some tooth to which the paint can adhere. I believe if you soak and prime, you will have success in this area. Best wishes and good health to all my fellow modelers! Virginia Cork