Penofin has a marine oil product which is different then there house oils. Most Exterior wood oils do not leave a film on your house. If your house is rough cut cedar you will see what your friend is seeing. All part of the experience. Tell him to vinyl side his house and the issues will go away. Look into Sikkins SRD. Leaves a bit of a poly top coat on your house. Their log and siding products are outstanding but expensive 110 a gallon retail!
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