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Pine tree sap is damaging my deck. What are my options?A: Sap from trees — pines or others — is a real problem ... penetrating stains and sealers as well as water-based products that color wood with different levels of opacity.
University of Queensland studies have used a natural tree sap gum and light to extend the ... severity by 20% without compromising the fruit's color or firmness." Dr. Seididamyeh said chemical ...
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