OK, before any of you say search, I've already tried searching but just can't seem to find it. I've read somewhere before about painting polyurethrane lips and that you have to add something to the paint so that the paint will actually flex with the lip and that so the paint won't crack? What is it? I just need to know what it's called. Thanks, any feedback is muchly appreciated.

 

flex additive

 

^yup. I don't know where to get it from. Try a paint shop.