Looking at the Plastimayd liners they have 20, 28 a mix of these and an ultra series with some blend of stuff to supposedly resist heat, uv, and chemical deterioration to last up to 50% longer. The warranty for the ultra also covers sun rot which the warranty for the 28 mil doesn't. But the ultra only comes in 20 mil thickness. The builder is looking into this some more but he usually installs 28 mil. The price difference is maybe $150 more for the ultra and we can get the color we want too.
Does anyone have any experience with the ultra series? I do get a lot of sun on the pool. Is the thicker liner going to last 50% longer than a standard 20 mil liner anyway?