uv stable conformal coating

Hi folks, I have a conformal coating application where I need the coating to be UV stable for a number of years without any crazing or cracking of the coating. I have looked for such a coating and have come up empty handed. Much of the circuit board will be enclosed in a housing for protection from the elements but a portion of the board must be exposed only to be covered by a thin film of conformal coating. If anyone knows of a good coating that can withstand direct sunlight please reply.

Thank you, Jacob

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