I have a colonial house with 90% of the siding made of cedar shakes. The shakes were painted years ago and is now pealing badly in places. Would I be better off scrapping all the paint off and not paint them again or scapping only the really loose paint and painting again. The house is on Cape Cod not far from the ocean so painting probably won't last long. Also, what is the best way to sc**** the old paint off?