I had some hurricane Katrina felled live oak quarter sawn in to planks and have been air drying it for a couple of years now. I want to use this wood to make a 4 inch wide by 2 1/2 inch high rub rail. Although the wood will be varnished or painted, I'm concerned the oak might check with constant exposure to sun and weather. Anyone have experience with live or white oak as an exterior wood? Thanks.