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We have a 12 year-old wood frame house with pine log slab siding. It has been cleaned and treated twice with CWF-UV Clear Wood Finish. We are not impressed with CWF. Some sun-deprived areas have turned black. I suspect mold but one painting contractor believes its Tannin leaching from the log siding. Your thoughts? Should we wash with TSP/bleach mixture or corn-cob blast? What can we treat siding with to prevent mold re-forming? We like a clean, natural look.


You should corn cob blast it clean and then put a good quality log home stain on it. Do not use the CWF, or it will turn black again. CWF has a lot of paraffin (wax) in it and it breaks down fast. 6 months to 1 year.It has a tendency to promote black mold in some areas.

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