If you are getting estimates to replace "Acrylic" sliders I suggest you also get estimates to get "glass" replacements. Glass windows probably will require a different support structure but as you found out the Acrylis or pastic sliders over a period of time scratch, weaken, or just yellow and need replacing. The other big factor is that when (its going to happen) we get a big storm (ie hurricane) these type of windows will be more vulnerable to wind damage than properly installed glass windows.
Just a suggestion!
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