 In the 1940s Bau dedicated himself to family issues, various Catholic organizations and business; he became the first post-war president of Banco de Tortosa and later multiplied his wealth by trading shares of the bank, going on also with the inherited Aceites Bau business.Privately he pursued his interest in organ music.Bau led one of 3 competing Traditionalist Tarragona factions, namely the one opposing Carloctavistas and javieristas and promoting rapprochement with the Alfonsist claimant, Don Juan.