On 2/28/11 5:21 PM, Larry Kraus wrote:

My understanding and experience is that any clear finish on wood has a
relatively short exterior life span. UV rays (direct or reflected)
degrade the wood surface through the finish, and the finish has
nothing to cling to. Additives for UV resistance may slow the damage
but it still occurs. If you can see the wood, the light is breaking
down the surface. Personally, if it is outside, I feel wood should be
painted. Life is too short to spend it refinishing doors every few
years.

FWIW, I've never seen a painted house that didn't need repainted every 5
or so years.


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