Trains.com

Subscriber & Member Login

Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!

Plaster Disaster

2875 views
36 replies
1 rating 2 rating 3 rating 4 rating 5 rating
  • Member since
    February 2001
  • From: Wyoming, where men are men, and sheep are nervous!
  • 2,760 posts
Posted by Pruitt on Wednesday, April 7, 2021 8:24 PM

Just to bring this all to a close...

The plaster of paris over the roughed-up styrofoam worked very well. I was able to chip the plaster off, but it took some effort. The plaster didn't just flake away. It chipped in small chunks as I worked the putty knife under it, digging into the styrofoam as I went:

So I cleaned all the masking tape mess off the layout and roughed up the top surface of all that styrofoam.

I spent a couple days trying to figure out how to fill the gaps between the subroadbed, the backdrop and the styrofoam. Masking tape had been my first answer, but you all know how that came out! Then I realized I'd been using the answer all along while finishing the basement - the paper tape we were using for the drywall joints! DOH!

I glued it down to the styrofoam and subroadbed using wood glue. Although the paper is a bit stiff and tended to stick up over any irregularities, a misting of water convinced it to relax and follow any undulations in the surfaces. It looled like this after everything dried:

And last night I applied a slightly thicker coat of plaster of paris (tinted again) over a small area (I wasn't going to do the whole area again until I was sure it would work). This morning, after a light sanding to knock down the little points and peaks I had this:

And that's just about perfect! It didn't crumble under the sanding sponge as I pressed down on it, so this will work just fine!

Once again everyone, thank you for your ideas, suggestions, and commiseration with my plight. You gave me the fortitude and inspiration to press on to a solution. Virtual beers in the diner for each of you, on me.

Full steam ahead! 

  • Member since
    July 2006
  • From: Bradford, Ontario
  • 12,972 posts
Posted by hon30critter on Wednesday, April 7, 2021 8:31 PM

Hi Mark,

Thanks for finding a solution, and thanks for the beer!!

Dave

I'm just a dude with a bad back having a lot of fun with model trains, and finally building a layout!

  • Member since
    July 2006
  • From: Bradford, Ontario
  • 12,972 posts
Posted by hon30critter on Thursday, April 8, 2021 12:47 AM

Hi again Mark,

What did you use to rough up the surface of the foam?

Thanks,

Dave

I'm just a dude with a bad back having a lot of fun with model trains, and finally building a layout!

  • Member since
    February 2008
  • 1,726 posts
Posted by kasskaboose on Thursday, April 8, 2021 7:24 AM

Critter: You could use a rough grade of sandpaper or steel wool.

  • Member since
    June 2007
  • 8,322 posts
Posted by riogrande5761 on Thursday, April 8, 2021 8:22 AM

There is all that maroon eye sore wall again.  Dead

Rio Grande.  The Action Road  - Focus 1977-1983

  • Member since
    February 2001
  • From: Wyoming, where men are men, and sheep are nervous!
  • 2,760 posts
Posted by Pruitt on Thursday, April 8, 2021 8:52 AM

hon30critter
Hi again Mark,

What did you use to rough up the surface of the foam?

Thanks,

Dave

I used a surform tool. Chews up the surface real good! It's the out of focus yellow thing in this pic.

 

  • Member since
    July 2006
  • From: Bradford, Ontario
  • 12,972 posts
Posted by hon30critter on Thursday, April 8, 2021 8:36 PM

Pruitt
I used a surform tool

Great! I already have one of those.

Dave

I'm just a dude with a bad back having a lot of fun with model trains, and finally building a layout!

Subscriber & Member Login

Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!

Search the Community

ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT
Model Railroader Newsletter See all
Sign up for our FREE e-newsletter and get model railroad news in your inbox!