Sailboats benefit from a slightly rough hull turbulating the layrer of water contacting the hull. Wax prevents that turbulation. Actually leaving the hull "scuff sanded" to slightly dull with fine paper (appx 280 grit) helps. For just going out and having fun... no big deal. We're talking 1/10ths or 1/100'ths of mph difference. It can win or lose a race.