I am getting a few estimates for a new 20X40' vinyl liner quotes but unclear what to consider/ask besides the liner color/pattern/etc. I got a quote that references adding vermiculite (up to 20 sq. ft). Is that something that is typically done? Also, replacing inlet & outlet face plates and drain covers? Prep & Paint rust areas on walls? Should I replace skimmers (One of them typically sticks and doesn't open/close). I also have 2 LED lights in the pool, are those typically resealed?