I just painted my type VII hull on Friday and I used a prepping agent called Easy Surface Prep. I have used this stuff many times before and works great. They even claim that it will stick paint to glass. You just rub it on,then rub it off and paint after 90 minutes. If you can not get that brand, I am sure there are many products at your local paint store that will do the same job.Before you do anything, Wipe the hull with isopropel alcohole to get rid of all your waxy finger marks.You can get this from your chemist(Sorry,DRUG STORE).