Maybe someone can answer better - hard to know which of the products you mention are brand names (Papercraft?) and where you are drawing your terms from (plaster filler) as far as how you are using it. And I can't see why any reasonably paper mache project wouldn't be "presentable" for a lot longer than 10 minutes just as built. Epoxy resin on a layer of plaster "mud" for sheet rock (one possible meaning of plaster filler) on paper mache seems likely to be messy and prone to fail.