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bubbling paint on the cap ext?

having problem with reoccuring blisters /bubbles on a balcony cap. Bondod cap as needed, tried shellac, primers, sanding, seems that the sap is bleeding though. Any suggestions?
Don, February 2011
Have a look at this link

http://www.palacechemicals.co.uk/uploads/pdf/TDS%20LANGLOW%20PATENT%20KNOTTING%20SOLUTION.pdf

Maurice, February 2011