I am using duration paint on my 75 year old house now. I have a clapboard painted white house and with all the layers of white paint it doesn't last long with the undercoats pealing off. I have tried Duration the last two years on outbuilding and it appears to be working great. This year I am heating off all the old paint and painting the whole house with white duration paint. I hope the claim about not needing a primer is valid. No peeling with the outbuildings over old paint yet.