I like to use the soft pencil on the side of deck planking as it gives some variation and not perfect lines with each one. For me the variation livens up and makes the deck look more used and realistic than sterile perfection with all lines. Just my own thought and everyone has their own. RichYou can pencil the edges of the deck planks, or use black construction paper between them for caulking on the deck. Just an FYI for future builds. You’re doing a good job!