Primer with no topcoat?

What are the drawbacks to priming an area and never putting on a topcoat? Of course, the primer is flat, and the existing topcoat may be gloss (seems to be a bit shiny).
I am doing exterior repairs. Some new wood, some epoxy, some painting over old existing paint.
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snipped-for-privacy@yahoo.com wrote:

If you don't put on a top coat of exterior finish paint, you're wasting your time. Primer is meant to seal a surface and has additional bonding agents to make it stick. It is not designed to be exposed and will not last.
R
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If you are looking to "cheap out", that is not the way to go. Look for a good brand of latex exterior paint that does not need a primer. Doing it your way, the primer is not durable at all as it is designed to hold the next layer, not block the UV rays and moisture.
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