Also about the primer job,
The problem with primer as a finish is twofold:
1. No primer (not even epoxy) is meant to be weatherproof. It will eventually surface rust underneath the primer, although epoxy primer is the best option by far.
2. The problem with epoxy on a driver isn't as much water resistance as it is uv resistance. Epoxy primer has NO uv resistance. This is because it is formulated to be topcoated. Paint companies don't spend the money to add UV resistant properties to materials that are only meant to be used below the topcoat. This is why paint companies offer flattening agents to be used in their clear coats. The look of flat primer but the protection of clear coat.
