It should be problematic to become a member of the EU after secession

Democracy is more than laws, but without laws, there is no democracy neither in Catalonia, nor in Spain nor anywhere in Europe
RULE OF LAW
ProU aims to show the European citizens that Catalonia is an open and plural society in which the majority believes in complying with the rule of law and in seeking social improvement through the existing constitutional channels, the Catalan and Spanish parliaments.
DEMOCRACY
ProU was born in response to the secessionist challenge of less than half of population which has created deep social breakdown and divide in Catalonia, yet regional government institutions have been hijacked by separatist parties which constantly challenge its democratic constitutional legal order and functioning to achieve independence via street agitation, public media control and forcing legislative changes without legal prerrogatives.
Pluralism
ProU seeks to higlight the pluralistic nature of Catalan society and the existence of very diverse proposals of solutions to the Catalan stalemate, provided they are respectful of the Spanish constitutional framework (including those which endorse its reform).
Citizenship
ProU categorically rejects the label "Un sol poble" (One People) used by secessionists to identify "good Catalans" (pro-independence) from "bad Catalans" (against-independence). The crucial divide today is not between "Catalonia vs. Spain" but between Catalans themselves!