I am a member of the Police Departments Dive Team. We have a utility vehicle that has a large vinyl sticker on the side of the truck of a Kirby Morgan Dive Helmet over the international dive flag. The colors involved are yellow, blue and gold. The sticker on the truck is about ten years old and all of the color has faded out. The black is still dark so I thought I could air brush some color back in. I'm just not sure what type of paint will be the best to shoot through an air brush that will stand up to outdoor sunlight. I also need something that will not damage the vinyl sticker I will be painting on. I was think of using an oil based enamel that was thinned enough to go through my brush. What do you think would be my best option.