The sad thing is that I used Tamiya tape for the outline and the low-sticky Scotch tape we've been using for the larger areas. However, Eduard's kit parts come with a very smooth, shiny surface and I don't believe I properly scuffed the areas where the paint didn't stick. I used 8000 grit sandpaper to help the primer "bite" the plastic but I must not have sanded quite enough. The only blame I can place for the error is myself--kit, paints, and tape aren't really at fault on this one! At least it was easily corrected.