Welcome to our forum.
Doc--Are your covers ASTM certified?
There's no such thing ASTM doesn't certify anything, they just develop the standards.......... But yes, our covers meet the ASTM standard F 1346-91, for a manual safety spa cover.
Chas--Actually density of foam w/ HS depends on the size of the spa. Many are 2#.
That's what I said.... 8-)
Gombo--In my opinion you have excessive puddling. Did you report it to your dealer before 2 years was up. Since you have a Watkins lifter, if you have a warranty situation, you have labor included to change out the cores.