I had a large Birch trunk laying outside all winter and just now got it sectioned and turned into 4 large,13"+ diameter bowls of various shapes. Immediately upon completion they were coated with Titebond II and set aside to dry. Picked them up the next day for weighing and noticed significant blue/gray mold spots under the PVA sealcoat, and growing daily. Having never encountered this before I'm wondering what to do, if anything. I'm particularly intrigued by the fact this is growing under the sealant. Any help will be appreciated.