Wow! That's what people say about Washington Poster's Signage Systems. Visually appealing, adaptive, durable, and easy-to-maintain, our Signage Systems have been carefully engineered to effectively merchandise your products. WP Sign Systems is the innovative leader in supermarket signage. Our WP Channel System, LiquiChalk Signage System, ChalkArt Signage System, and MagArt Signage System are the ...