Care for your Cargo Fly with TIZIP lubricant. Spare 8gr tube to refill your repair kit.
Clean and dry TIZIP first with mild soap and water, then apply a small amount to each side of the zip at 5cm increments. Run zip back and forth multiple times to spread the lube evenly. Ensure dock end (closing end) has a small amount of lube around the dock. Remove excess with a clean rag.