This is the perfect place to use SEM products. You can use aerosols and get great results. You will need to use their cleaner, (SEM soap), their vinyl prep, and possibly their adhesion promoter. It is easy, and if you take your time it will look great. Here's a link that tells you exactly how to do it: CLICK HERE
Here's a place online to buy what you need: CLICK HERE
When you spray this stuff on, it gets absorbed into the vinyl, it doesn't sit on the surface. It will look like it came that way when you're done.