Check out the internet mate for a two pack exterior paint anything else will peel and you would be best not sure about pva as Archiehood say you need something that will soak into the concrete not sit on the top i dont think the pva will bond with the paint it may react but ask the experts at these paint firms there are two pack paint on the bay for sale pm the seller it will be a company. we have specialist floor sealers in brochures at work pm me and will give you some companies on monday but it will be expensive
Mark