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clear lexan over aluminum sign

Discussion in 'General Signmaking Topics' started by signgal01, Jul 14, 2017.

  1. signgal01

    signgal01 Member

    Sep 17, 2010
    I have a sign project that the local city council, county commissioners and numerous other committees didn't want just a laminated printed graphics on aluminum in a metal frame. So they asked for a clear Lexan sheet on top of the aluminum panel with graphics. Here is my question, would your sandwich the two pieces (aluminum and clear lexan) and seal the edges with calk before putting in steel frame or leave the two pieces in the frame loose? My worry is condensation of moisture between the two pieces.

    Thanks, Vicki
  2. I wouldn't worry about the condensation as much as the softness of the Lexan and how easily it will get scratched. I'm assuming in their infinite wisdom this is an effort to make the sign more vandal proof. Acrylite would be better suited in this application IMHO
  3. Billct2

    Billct2 Major Contributor

    Mar 12, 2005
    New England
    Yep, what's the point? To make a "vandal proof" sign? If the purpose of the lexan is to protect the sign there are always issues with how to make it work.
    Condensation, dirt, insects can all get between the two faces. I have found that the best option it to leave a wide gap using some kind of stand offs.
    • Agree Agree x 1
  4. IslandSignWorks

    IslandSignWorks Member

    Jun 14, 2014
    Maine USA
    The sealant will eventually crack and fail and you will get moisture inside, mold, maybe bugs, etc. Aluminum and acrylic expand and contract at different rates, so the chance that these two layers are going to stay together forever is pretty slim.

    If graffiti is the concern, there are some anti-graffiti overlams on the market that make it easier to remove spray paint, marker, etc. OL-1000 Premium Anti-Graffiti | Avery Dennison | Reflectives

    If straight up vandalism is the concern, there's not much you can do about that.

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