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Removing spray foam insulation

Discussion in 'The Hokey Ass Message Board' started by Rusty O'Toole, Apr 18, 2013.

  1. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,756

    Rusty O'Toole
    Member

    I bought a 1966 Dodge a while back. For whatever reason, I don't know, a previous owner sprayed foam insulation inside the trunk between the fender and trunk drop, around the wheel wells, across the back of the trunk lid, inside the front fenders, a real mess.

    Is there any way to get this stuff off? The only way I can think of is to carve it out with a knife and scrape the rest off. I guess I am looking for an easier way to get rid of it.
     
  2. captainjunk#2
    Joined: Mar 13, 2008
    Posts: 4,420

    captainjunk#2
    Member

    I wonder if some chemical like acetone would turn it to goo and you could wipe it out with rags ? id wear a respirator , cutting it might be the best bet
     
  3. KRB52
    Joined: Jul 9, 2011
    Posts: 1,077

    KRB52
    Member
    from Conneticut

    You may find the cut 'n scrape method to be the best bet. Check some of the cans on your next trip to the hardware store and see what the label says for thinning and clean up. I know that this stuff is now popular to fill rust holes and such in the usual POS vehicles.
     
  4. dtracy
    Joined: May 8, 2012
    Posts: 223

    dtracy
    Member

    Like KRB52 wrote, it's probably holdong the car together from the back side and is covered with an inch of secret sauce on the outside. You might be opening a very large can of worms!

    Dave.
     
  5. NEWFISHER
    Joined: Dec 16, 2011
    Posts: 591

    NEWFISHER
    Member
    from Oregon

    It's flamable ( ask me how I know) don't get a torch or nail gun near it.
     
  6. philjafo
    Joined: Dec 22, 2012
    Posts: 42

    philjafo
    Member
    from right here

  7. swissmike
    Joined: Oct 22, 2003
    Posts: 1,297

    swissmike
    Member

    Philjafo - iwas just going to suggest the same except the HF version that mounts on the angle grinder. Cut as much off wich a knife, saw bade, etc. in order to minimize the amount of dust coming off the wheel.
     
  8. pdq67
    Joined: Feb 12, 2007
    Posts: 787

    pdq67
    Member

    Try some Methylene Chloride if you can find it..

    Stuff will remove the smile from Mr. Cleans face by me.

    pdq67
     
  9. PKap
    Joined: Jan 5, 2011
    Posts: 593

    PKap
    Member
    from Alberta

    Some foams will cut with a hot wire cutter. Guys building with Icf foundations, or stucco over xps foam use them for shaping. You could carve out big chunks and then grind the last down to whatever metal is left. Either way, it won't be fun.


    Posted from the TJJ App for iPhone & iPad
     
  10. swissmike
    Joined: Oct 22, 2003
    Posts: 1,297

    swissmike
    Member

    Hot wire will only cut thermoplastic like polystyrene, etc. Spray foam is more like a thermoset that will not melt, but stay solid until it burns up or chars.
     
  11. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,756

    Rusty O'Toole
    Member

    I know what is wrong with the car lol. It has a few rust holes (still visible on the outside) but nothing to justify filling the car with foam.

    I want to cut out the rust and repair the car properly but have to remove the foam first.

    Whoever had the car, shot it full of foam and left it, did no bodywork or paint on the outside. Except for spraying some spray bombs at the rust spots.
     
  12. Kerrynzl
    Joined: Jun 20, 2010
    Posts: 3,574

    Kerrynzl
    Member

    Try freezing it with Dry Ice and then cracking it loose.
    This works great with sound deadener, so it should shift foam
     
  13. Dexter The Dog
    Joined: Jun 27, 2009
    Posts: 195

    Dexter The Dog
    Member

    Too much of this and you'll not only never have kids but you will be gurgling and drooling all over yourself as well, possibly forever.

    It's available at any plexiglas or commercial plastics outlet.
    Do Not leave the container open. Aside from the fumes it will evaporate at about the rate of 1/2 oz. a minute.
     
  14. Dexter The Dog
    Joined: Jun 27, 2009
    Posts: 195

    Dexter The Dog
    Member

    Take an old serving spoon and grind the lead edge into a rough sharp blade and you can scoop and scrape most of it off. Run a shop vac while you're doing this because it is very good friends with static electricity.

    This is how we used to get sculpted foam "plugs" out of one off fibreglass parts.
     
  15. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,756

    Rusty O'Toole
    Member

    Good idea. How about a sharpened garden trowel or would it be too big?
     
  16. Chevy Gasser
    Joined: Jan 23, 2007
    Posts: 720

    Chevy Gasser
    Member

    I think a sand blaster would blow right through the stuff and clean the metal somewhat at the same time.
     
  17. Pops1532
    Joined: Jun 19, 2011
    Posts: 544

    Pops1532
    Member
    from Illinois

  18. Dexter The Dog
    Joined: Jun 27, 2009
    Posts: 195

    Dexter The Dog
    Member

    Try it - whatever works. just make sure you dull it again before you put it back. She won't be happy to find out you were in her side of the garage!
     
  19. Mr48chev
    Joined: Dec 28, 2007
    Posts: 35,611

    Mr48chev
    ALLIANCE MEMBER

    depending on how big the space to work is you could probably use a few different tools.
     
  20. Good advice from all .I got a old ford van in years ago someone had filled the quarters with Concrete I sent it down the road
     
  21. msalamanca
    Joined: May 25, 2011
    Posts: 526

    msalamanca
    Member

    cut and scrape. Dont use a solvent
     

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