German Smear Floor . Once you apply a mortar wash to your house, you would. The look of german smear. German Smear (white wash) over faux brick paneling White wash brick from www.pinterest.com Here, you must remember that you shouldn’t let the mortar perfectly set and dry since this will only ruin the german smear technique you use from the beginning. German smear brick is another favorite topic of brick wall coloring project. Other techniques use regular exterior paint thats usually been watered down.