Answer: What you've heard is somewhat accurate. The gel-like substance is called sap and pine trees will exude sap if it is injured (such as when a branch breaks off) or if it has an insect infestation (such a borers). It will also exude sap through natural openings in the fissures of the bark if the weather is hot and the tree is actively growing. Eventually the sap will harden and clog the area so no more sap will trickle out. I wouldn't do anything except simply watch the trees for signs of insect problems. If you find nothing, chalk it up to a normal occurance. Best wishes with your trees!
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