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Thread: Should I use Lightweight Filler to fill Hollow spaces ?

  1. #1
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    Should I use Lightweight Filler to fill Hollow spaces ?

    I need some expert advice on filler material that also adds strength. My car has hollow spaces that i want to fill. For example, my hood consists of the fiero base with the ferrari shell bonded with fiberglass on top of it. There is a hollow space in between. I want to fill this space with something that strengthens to hood, but also doesn't add too much weight. Spray foam insulation isn't gonna do it I'm afraid - not enough strength.

    Any advice from experienced builders ? Thank you.

  2. #2
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    It seems than an injected foam is the only answer to a confined space like this. Use the mild expansion stuff. You will be surprised by the rigidity it ads.
    And the joke is,<br />when he awoke his,<br />body was covered in Coke fizz !

  3. #3
    Senior Member MacGyver's Avatar
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    2 part foam 2lb or 4lb will do the trick. Avoid the spray foam from the hardware store.

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    Quote Originally Posted by MacGyver View Post

    2 part foam 2lb or 4lb will do the trick. Avoid the spray foam from the hardware store.
    I never heard of 2 part foam. Is there a more specific name or brand to ask for ? Can I get it at an auto paint supply house ? thanks.

    Daleford - the spray foam scares me because if i put it in, i'm done and can't re-do it. I was gonna stuff the spaces with fiberglass-bondo (which i think would add structure) but it would be too heavy.

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  6. #6
    Senior Member MacGyver's Avatar
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    Quote Originally Posted by Corson008 View Post
    I never heard of 2 part foam. Is there a more specific name or brand to ask for ? Can I get it at an auto paint supply house ? thanks.

    Daleford - the spray foam scares me because if i put it in, i'm done and can't re-do it. I was gonna stuff the spaces with fiberglass-bondo (which i think would add structure) but it would be too heavy.
    Typically found at a marine supply or fiberglass supply house.

    Urethane Foam , Expanding Marine Polyurethane Foam

  7. #7
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    I agree injecting foam would be better compared with using a regular filler. What Macgyver posted would be a good brand and product to use.

  8. #8
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    Try the foam it works well and you will be happy with the result however if not there are cleaver and easy ways of removing the foam later. Good luck...


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