TE2 is made out of HIPS, the recent run TE did was HDPE. What makes the Rustoleum so nice is that it is a hard paint, but that also makes it rigid. The HDPE has more flex than HIPS or ABS there fore you need a more flexible paint. You may want to experiment with bumper paint, or a high latex content hobby paint.
Just as a disclaimer, I've never worked with HDPE and these are just my ideas from being very familiar with paint.