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Thanks to both of you for the input. It definitely seems like a worthy investment to make. If anyone esle uses them, please let me know. Thanks
Prolly cause it is. That was the original blanket, from another company, that only lasted something like 40 days. The pic below it shows the new, my, blanket, that's still going strong (gawd, at least I sure hope it is )
OH, and I learned the foam grows when it sits on warm water for a bit. Kinda weird. I went to a bit of trouble to cut a PERFECT circle for my round spa. I even made it 1/8" too small so it would be easy to put on the water. It was just lovely . Went out the next morning, it had become almost 1/2" too large. I figure all the little air bubbles in the foam expanded a bit when they got warmed up by the spa water.
My cover is 3 YO and the outside is showing signs of deteriation ... I guess I haven't used the 303 enough or maybe this cover is just starting to go.
The other thing I did was use GOOD QUALITY duct tape as a backer for the spa leash. It reinforced the area of stress where the blanket wa being pulled up on by the blanket leash.