I have used the West Marine sealant with good results. When my bimini was reaching the end of it's useful life, just for the heck of it and at the advice of a frugal dock mate, I used Thompson's Water Seal for one season. It was certainly less expensive and worked really well. I had Persian Green Sunbrella at the time that was very faded. The Thompsons did not alter the color, streak, crack.......It actually worked.