Re: bleed through exterior
The "sap" oozing from your trim boards is a natural product of the wood...... actually called pitch.
Originally Posted by jeff haro
Ther pine is a member of the conifer species which have large pitch pockets.
When the wood gets hot enough the pitch melts and runs out of the lumber .
Properly kiln dried lumber that has been heated to more than 160 degrees solidifies the pitch usually does not suffer from this problem. Likely the lumber used for your trim was either not kiln dried or wasn't dried at a high enough temperature to cause this solidification.
There's not a lot you can do about the problem at this point except live with it or have it replaced. As the trim boards heat up the pitch will continue to run from the boards.
There is no sealer made that can contain it under these conditions.
But the news is not all bad ........ a bit of turpentine on a rag will remove it quickly and eventually the pitch pockets will run dry ( in a few years ).
As for the black staining it could be from the fasteners ---- especially if they didn't use coated or stainless steel.
Hope this helps.
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