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[Gene GeRue <genegerue AT ruralize.com>]

On Mar 8, 2009, at 12:57 PM, Mogrits wrote:

> On Sun, Mar 8, 2009 at 1:42 PM, Gene GeRue <genegerue AT ruralize.com>  
> wrote:
> > Warren, please educate me on why silicone caulk would be bad for
> > sealing metal roof nail holes.
>
> Because silicone breaks down in sunlight. Additionally, it loses
> adhesion to metal over time. Even the "UV resistant" silicones seem to
> shrink with age and eventually pull away.

Thanks. The metal roof on my wood-drying shed I built about twenty- 
five years ago has a few leaks and I think you have provided the why.