mold after finishing

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Forum topic by PatRI posted 01-04-2015 11:02 PM 509 views 0 times favorited 1 reply Add to Favorites Watch
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11 posts in 1566 days

01-04-2015 11:02 PM

Hello I am having trouble with what looks like mold showing up on some of my projects. Here are some pictures of a couple spoons I made and you can see the greenish black spots on them after my wife washed them once. They were not soaked just washed and dried then these spots appeared the next morning. They are finished with butcherblock oil then beeswax. I have also had the same trouble a few months ago with some white oak swings I finished with Thompson’s water seal. After sealer dried had same spots around the glue line where I wiped the glue with a wet towel. Has anyone else had problems like this? Or does anyone have an idea to stop this from happening in the future. Thanks in advance for your help.

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986 posts in 2063 days

#1 posted 01-05-2015 04:55 AM

Could be what they call Lumberyard Mold which was in the material prior to forming your spoons. If the moisture in wood is greater than 17 MC, mold chances increase and can be worse in sapwood vs Hartwood.

Pin probe type moisture meters are used to ascertain the Moisture Content (MC) of the installed or stored lumber. Wood is considered dry below 15 to 17 MC Potential for mold growth with >17% MC Potential for wood decay fungi with >20%MC

All fungi have four basic elements for growth: suitable temperature, oxygen, food and moisture. Eliminating one of these elements can prevent fungal growth.

Sanding wood surfaces to remove mold is physically possible for smooth surfaces combined with HEPA vacuuming or using bleach but with bleach or similar agents can create a cosmetic problem or a problem with future adhesion of finish coatings .

-- Respectfully, Paul

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