As my dad continues his Bismark build, he's reached the stage where wooden decks need to be treated.
The instructions say to spray them with matt varnish and then smooth with fine wire wool.
It works a treat. The varnish raises the grain very slightly but a rub with wire wool renders it smooth as a the proverbial babies backside. I suppose a mild abrasive would work just as well but this is certainly effective and so simple. Best of all, wire wool is cheap and readily available from the decorating sections of DIY outlets.