Does anyone know why secondary glazing (ie perspex sheets fitted inside the window) are typically connected to the windows with magnetic strips? I'm wondering if anyone has used velcro strips instead, and what the downsides are?

  • What is this application for ? Is this for solar panels ? Just wondering never heard of it.
    – user101687
    Jun 20, 2019 at 13:08
  • 1
    Velcro won't be airtight. That would seem to be prohibitive.
    – isherwood
    Jun 20, 2019 at 15:18
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    I have velcro-mounted window AC shroud. Velcro catches dirt that can never be removed. Also, velcro settles, the shroud never sticks exactly where I've put it, it sags few mm and then stays there. Also, magnets can be very strong but very small, while velcro is always obnoxiously big.
    – Agent_L
    Jun 20, 2019 at 15:53

1 Answer 1


The magnetic strips will, imho, separate easier compared to velcro, so subsequent removal for cleaning etc is easier.

Once you get magnets sufficiently far apart, then the force becomes much lower.

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