Timber Pro XP Formula is a specialized waterborne acrylic finish that accentuates the natural beauty of the wood, providing unsurpassed protection against the sun’s damaging UV rays and the destructive effects of the elements. XP Formula is a long-lasting, durable coating that allows flexibility as an exterior and interior finish for most structures built in harsh climates. This, combined with a fast-dry, low-VOC. formula and non-yellowing properties makes it the best choice in finishes for many of your exterior and interior wood-coating needs.