<p>It is common practice that paint companies change BASES every couple/few years but use the same formula. Unfortunately, when they change the base formula, the color changes somewhat. That is good reason to make sure you have ample supply of leftover paint for a couple/few years for touch-up. After that time, even the exact same paint won’t match because of fading with sun exposure. Also, the darker you go the more likelihood of fading…</p>