I have a pair of rockers given to us for our porch. They are not the sort of wood that weathers nicely outdoors. Here in Colorado it is hot and dry and the sun is merciless. I would like to refinish them so they'll hold up at least one summer. I have tried marine paint as well as enamel and polyurethane. Any ideas? They have sentimental value if little actual value and I'd like to save them.