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Question on Using Ground Goop

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  • Member since
    June, 2003
  • From: Greer, SC USA
  • 93 posts
Question on Using Ground Goop
Posted by mrnimble on Wednesday, September 13, 2017 1:19 PM

Hello all,

I am adding a yard to my existing layout for which I used mostly Gypsolite over Plaster Cloth as my scenery base.  That portion of the layout portrays a somewhat mountainous terrain and worked well using conventional ground cover techniques, rocks, cliffs, lots of conifers, etc.

For my expansion, the area beyond the "flat as a marble counter top" trackage area, the base is plywood.  Beyond that I have used the above extruded foam and other materials to build up a scene of a gentler, rolling hill landscape.

My question: do I need to cover all of the foam surfaces and plywood surfaces with plaster cloth and then spread ground goop (the classic recipe) over that OR, can I spread gound goop directly onto the exposed plywood and foam?

Thanks, geoff

Tags: ground goop
  • Member since
    September, 2003
  • From: Omaha, NE
  • 9,120 posts
Posted by dehusman on Wednesday, September 13, 2017 1:24 PM

You can apply it directly.


Dave H. Painted side goes up.

  • Member since
    January, 2009
  • 2,775 posts
Posted by RR_Mel on Wednesday, September 13, 2017 1:25 PM

I’ve used all kinds of scenery material direct to (¾“) plywood with out any problems for over 30 years.
Modeling the early to mid 1950s SP in HO scale since 1951
My Model Railroad   
Bakersfield, California
I'm beginning to realize that aging is not for wimps.
  • Member since
    February, 2005
  • From: Vancouver Island, BC
  • 21,315 posts
Posted by selector on Wednesday, September 13, 2017 5:48 PM

For a little cheap insurance, I would consider spreading some full-strength wood glue over much of the surface you are covering and let it mostly dry.  The glue will bond to the wood, but some will also work its way into the goop when you apply it.  Eventually the goop should be good 'n stuck.

  • Member since
    July, 2006
  • From: Flushing,Michigan
  • 822 posts
Posted by HaroldA on Tuesday, September 19, 2017 10:23 AM

I've done both.  The thing is with ground goop is that it's extremely difficult to remove if you want to make any changes.  I would still use it, however, in only places where I would consider it permanent.

There's never time to do it right, but always time to do it over.....

  • Member since
    August, 2003
  • From: Canada
  • 1,181 posts
Posted by wickman on Wednesday, September 20, 2017 2:55 PM

I have used it quite a bit and it will stick to anything because of the glue in it, I think I would consider painting the bare wood though with a cheap paint just to seal it, I tend to think the ground goop ingredients will tend to get sopped up by the raw wood.

  • Member since
    August, 2010
  • From: Columbia, IL
  • 260 posts
Posted by wdcrvr on Thursday, September 21, 2017 10:43 AM

I only have a little experience with ground goop but I am using it to help with the contruction of my HO layout.  Where I am applying goop to an area that is wood structure underneath, I have been first putting down a thin layer of foamcore.  I buy the cheap $1 sheets at Dollar General / Dollar Store.  I peel off the paper coating which just leaves a thin piece of the foam.  I glue that down to the wood and then I apply the goop on top of that.  It sticks well.  And I feel that the foam underneath will help in the removal process if I have to change it for some reason in the future.  My only complaint with this method is that the goop takes forever (3-4 days sometimes) to harden completely.  It skins over right away but then is soft underneath for days.  If anyone has an answer for the drying time problem I would appreciate the info.


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