Juswundrin

Hello Could anyone recommend something similar to "Cuprinol 5-Star" (I think that's what it's called); we've got a couple of window lintels in outbuildings which have seen better days (sun/rain exposure & neglected painting, nothing else) and, while structurally OK, I'd like to stop them from deteriorating further, so need something that treats such damage & prevents further deterioration. Thanks for any help.