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Take a plastic lid from a coffee can. Cut it to fit inside the wood filler can. Drop in in after you use the filler. Is will reduce the amount of surface air on the filler remaining in the can. When teh can is about 1/2 full try to push all filler uniforml;y to the bottom to allow lid to rest across without large air viods.
It will help keep the filler moist longer.
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