SteveCaz,
You are on the right track so far to further prevent small nicks in your paint. As calpolyarc mentioned, the technology and quality of films have come a long way in 13 years. Some of the films that are manufactured today usually come with 10 year warranties and are designed to prevent yellowing. In some cases these films can be self-healing to small rock impacts and surface scratches that will heal with the heat from the sun. Having a quality installer is very important too.
In regards to SteveCaz’s question, heat is not an issue for some films on the market. Just make sure to do research on the film you are wanting and to make sure the installer has a good reputation. Hope all this information helps. Let me know if we can answer any more questions for you.