A rough, crinkled surface can usually be traced to painting in
less than perfect weather conditions. - The surface being
painted, or the weather itself, was too hot. - A freshly painted
latex surface was exposed to rain, dew, fog, or other high
humidity levels before it could dry. - A top coat was applied
before the undercoat was fully dry. - A solvent-based paint was
applied too thickly. - Paint was applied over a dirty, waxy, or
otherwise contaminated surface. What to do: - Remove all old
paint by scraping and sanding. Once you are down to the bare
wood (or other substrate), prime and then top with two coats of
exterior latex paint.