For the white lines on IE stock, you can either use decals, or mask it very carefully and paint it. The RPSI lining would be too fine for paint, either decals or possibly a lining pen would be your best option. Haven't used a lining pen myself, but they are supposed to be quite tricky to use well, so if you weren't confident , a set of decals would do the job well. These would likely come with RPSI lettering and numbers etc along with the lining, so maybe the best way to get a good coach easily