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Please include what the finish is. The conditions at my house had mildew (maybe fogging) under tung oil bases sealants. My linseed oil based wood finish had mildew but easily corrected with a chlorine based cleanser. The tung oil based had to be completely stripped. A lot of labor but the manufacturer (Seafin) explained porous. I do not use shellac but hopefully Finnegan will chime in. The cloudiness is moisture and my guess with shellac is you have to get to bare wood. I have had products for over layments (not with marine use on teak) that once activated with a stripper in dry conditions would release the cloudiness. Again, please identify which products were used.