After the separation of Los Redondos, Solari started his first solo project in 2004: El Tesoro de los Inocentes (Bingo Fuel), together with his band Los Fundamentalistas del Aire Acondicionado, which was later presented in Argentina and Uruguay. In December 2007, The Fundamentalistas second album was released: Porco Rex, which was much less complex and very poetic. In the prologue he says: “Loneliness is the playing yard of Porco Rex”.