I filled the plywood panel butt joints with Elmer Interior Wood Filler using a putty knife, after the wood filler dried the joints were hand sanded with 150 grit sandpaper. I believe homosote is a paper based product, questionable if this wood filler would bond to homosote. Maybe a self leveling caulk might work, this is available at Menards, Home Depot , Lowes or your local hardware store.
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