How to avoid brown patches over newly painted wood panelling?

Mojdeh asked 4 years ago

I designed a remodel of an arts and crafts bungalow in southern California. The type of paint was not specified.

There was new wood paneling to match the existing. The new wood panels were painted white to match existing.

After about a month brown patches have appeared on the paint mainly above the screws of the panels. Is this due to the type of paint that was applied or the type of screws that were used? Should the painting have been oil based with shellac or should the screws have been galvanized?

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