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  1. #1
    Join Date
    May 2009
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    San Francisco Bay Area
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    Styrene-to-Pink Foam: how glue?

    Been trying to get some styrene squares down on my pink foam so I can mount caboose handthrows to them.
    I cut the foam about 1/8" down (so the handthrow is lowered & under the throwbar, thus reducing the profile of those "catapults").

    First I tried CA, which seemed to melt the foam a wee bit.
    (Chem is not my strong suit )

    Then I used some acryllic caulk, which has been the miracle adhesive everywhere else.
    But it doesn't quite seem to be taking.

    Any suggestions?

    Worse comes to worse, I'll cut out the rest of the 1 7/8" out of the 2" foam under the square, & attach a 1 3/4" - 1 7/8" piece of wood to the ply base, & mount the handthrow on top of that.

    Thanks for yr thoughts!
    Cheers!
    --Mark

  2. #2
    Join Date
    Feb 2001
    Location
    Mississippi Gulf Coast, USA
    Age
    79
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    8,146
    You might try Liquid Nails for Projects/Foam. It's available for $3-4 at Home Depot and/or Lowe's. It comes in a 14 oz. cartridge that is used with a caulking gun. It's best to remove the plastic film from the foam board and bond directly to the foam, or the bond will eventually come loose.
    Hank....I may have to Grow Old, but I Never have to Grow UP!!!


  3. #3
    Join Date
    Dec 2007
    Location
    Philo, IL
    Age
    50
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    380
    Latex caulk will do the trick, but it will take a while (days to weeks) to dry between styrene sheet and styrene foam. The foam is slightly porous whereas the sheet is impervious.

    If you need a quicker solution, check Lowe's/Menard's/Home Depot/etc. for foam adhesive. Comes in a caulk tube and is made for adhering styrene foam to wood substrates. If it's safe for styrene foam, it should be OK for styrene sheet as well.

  4. #4
    Join Date
    Oct 2008
    Location
    South Central Kentucky
    Age
    61
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    1,637
    I don't know if this will affect the foam, but have you tried GOO (see the link below)? It seems to work on a bunch of materials.

    http://www.walthers.com/exec/productinfo/904-299

    Gary
    N Scale the Normal Scale© Greenbriar Delta & Rutland web site So many projects, so little time, The GD&R on TrainBoard. My other interests.

  5. #5
    Join Date
    Jul 2001
    Location
    Cheshire, UK
    Age
    63
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    1,787
    There are foam-friendly impact adhesives available (the type where you put a film on both parts, let it set a while, then push together) which will get round the slow drying of the caulks.
    I only have a UK catalogue and the names will probably be different over there, so I can't really help with an actual one to go look for.
    Mike

    Website

  6. #6
    Join Date
    Feb 2005
    Location
    Covington, WA.
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    2,785
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    JET products makes a foam freindly adhesive in the lineup they make. I used it for my Micro-Trains Z-scale track to fasten it to the foam.
    To Dad, thanks for giving me my love of trains! Green signals, westbound...

  7. #7
    Join Date
    Sep 2006
    Location
    Los Angeles County
    Age
    52
    Posts
    478
    Gorilla Glue will work. Go sparingly - they aren't kidding when they say it will expand 3X. And wipe up anything that oozes out, it's hell to remove once it sets. Paint thinner works, so does charcoal starter, to get it off your hands if you're quick enough.

    Then again, water-based contact cement sounds like less grief.

  8. #8
    Join Date
    Oct 2008
    Location
    Northern Kentucky
    Age
    62
    Posts
    705
    Although the topic is about gluing styrene to foam; as modelers we also find the need to glue glass (mirrors), rubber, nylon, steel, brass, aluminum, pvc etc. Just wondering if any silicone or epoxy type glues are foam safe. Are they too difficult to cut through once they have cured?

    Jerry

  9. #9
    Join Date
    Mar 2000
    Location
    Jeffersonville,Indiana,USA
    Age
    62
    Posts
    880
    The easiest way I have found to tell if an adhesive will work with foam, is to look at the label and if you see the word: FLAMMABLE anywhere on the label, DON"T USE IT. I found out the hard way that some types of LIQUID NAILS will NOT work with foamboard. Makes one H*** of a mess and once the reaction starts, it's not going to stop until it wants to! PLEASE don't ask how I know this, the smell alone almost got me divorced!
    Look at the label. You are looking for NON-FLAMMABLE somewhere on the label, usually LATEX based and water wash up.
    I use adhesive-caulk for almost anything to do with bonding foam to almost anything else.
    DIESELS?!?!?! We don't need NO stinkin' Diesels!!!!

    The INDIANA RAILWAY.......Still 100% Steam Powered in 2014
    MARK


    Don't look back. Something might be gaining on you.
    Satchel Paige

  10. #10
    Join Date
    Aug 2006
    Location
    Naperville, IL
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    58
    Posts
    158
    Quote Originally Posted by Richard320 View Post
    Gorilla Glue will work. Go sparingly - they aren't kidding when they say it will expand 3X. And wipe up anything that oozes out, it's hell to remove once it sets.
    I've just started using Gorilla Glue and it seems to bond EVERYTHING. I even used it to glue new heels to a pair of shoes.

    True about the expansion but you can trim off any "overgrowth" with a sharp blade. (My son the attorney advises me to warn you to use due caution and I disclaim any liability for you slicing yourself open...)

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