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Quick dissolving floating foam has a multitude of uses including protecting hook points in weed or snags, showing the position of a rig after casting, preventing tangles when casting long hairs, making Spitback rigs, etc. Also used to pack spods to prevent bait spillage during long casts.
Top Tip - For quick discharge just nick the hook into the foam. For a longer dissolve rate, 'lick 'n stick' the foam nugget by wrapping and squeezing it around the hook. It will remain on the hook longer before popping to the surface.