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My protective coating knowledge is very stale. I used to be involved with the application of industrial paints that were specified by corrosion engineers. Epoxies tend to chaulk when exposed to weather. Most epoxy paints are not formulated as top coats. They are heavily mixed with fillers to achieve single coat thickness, or millage; the term used in the trade. Consequently we have high build primers, coal-tar epoxies, zinc-rich sacrificial paints, and so on. The various epoxy resins are notable for their adhesive properties and durability. I suggest that if you can't find a clear epoxy paint, and still want to use it, get some two component epoxy glue syringes and mix them together with xylol, xylene, MEK, or similar solvent. Use that as paint by dipping or brushing in a warm environment. I wouldn't go to the trouble. I think you will find a two component polyurethane to work better. This would be something like a clear DuPont Imron. If it is too glossy, add some flattening agent.
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