In warm climates, where so many of us keep boats or aspire to cruise, fabric bimini tops and spray dodgers suffer the wrath of year-round sun and exposure to the elements. First they start leaking, and have to be waterproofed periodically. Then the thread breaks down, requiring more and more re-stitching. Finally, at least on Silverheels, my ketch-rigged Pearson 424 built in 1978, the whole shooting match needs to be replaced every five to seven years. It's a bothersome, costly, recurring maintenance item.