Yes, to waterproof your swag, set it up, remove the mattress and thoroughly soak the exterior canvas with water focusing on the seams and stitching. Doing this allows the thread and canvas to swell thus taking up any potential leaks in the stitching. Allow to dry, particularly the seams. It is the drying that seals the seams. Repeat this process twice to completely ensure the seams are waterproof.Your swag will arrive with a full set of instructions that explain this process in detail.