Here’s your complete guide to sealing your RV roof seams: 💡 Roof seams (middle sections only) Use Dicor Lap Sealant Self-Leveling. This stuff flattens out (or “levels”) on its own… so it does a great job of completely filling the gaps. Handy when you’re sealing a flat spot up top. 🪜 Roof perimeters (the edge of the roof) Use Dicor Non-Sag Lap Sealant. You want it to stay where you put it, because if it runs, it’ll drip down your siding and make a big mess. 🪟 Side trim, windows, and lights Pic