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re: molds

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  • Member since
    May 2005
  • From: Huntington WEST Virginia
  • 384 posts
Posted by ChessieFan13 on Saturday, June 25, 2005 10:04 PM
ok thanks dave that seems like it may work thank you
  • Member since
    April 2003
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Posted by Anonymous on Saturday, June 25, 2005 10:00 PM
The problem is in your second sentence. You don't wait for it to get almost dry and put it on the foam.

Crinkle the foil. Pour the plaster in the foil and slap it WET against the foam. THEN wait for it to get warm and peel off. You don't want it to harden off the foam (or whatever you are putting it on).

Dave H.
  • Member since
    July 2004
  • From: Weymouth, Ma.
  • 5,199 posts
Posted by bogp40 on Saturday, June 25, 2005 8:34 PM
If the mold isn't wet/ sloppy enough when placed on the hillside it may not bond. To remedy this, I use a fresh batch of plaster buttered to the molds as they are placed. Many times for effect, I will let a mold get very firm so that when placed and shaped to contour, the mold crumbles or cracks. Once removed, the many fractures look great. If small sections or pieces come off w/ the mold, just glue them back.
Bob K.

Modeling B&O- Chessie  Bob K.  www.ssmrc.org

  • Member since
    December 2004
  • From: Bedford, MA, USA
  • 21,483 posts
Posted by MisterBeasley on Friday, June 24, 2005 4:44 PM
Just proof that great minds run down the same track.

It takes an iron man to play with a toy iron horse. 

  • Member since
    July 2003
  • From: Metro East St. Louis
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Posted by simon1966 on Friday, June 24, 2005 3:31 PM
If you spray the foil with "wet" water (regular tap water with a couple of drops of dish detergent in it) just before you pour the plaster it will make it a lot easier to peel off the foil at after it has dried.

Honest guv, I wasn't looking over Mr Beasleys shoulder!!

Simon Modelling CB&Q and Wabash See my slowly evolving layout on my picturetrail site http://www.picturetrail.com/simontrains and our videos at http://www.youtube.com/user/MrCrispybake?feature=mhum

  • Member since
    December 2004
  • From: Bedford, MA, USA
  • 21,483 posts
Posted by MisterBeasley on Friday, June 24, 2005 3:30 PM
I always spray my molds with a bit of "wet water" before I pour in the hydrocal. Wet water is about a cup of water with a couple of drops of dishwashing liquid in it. I've got it in a spray bottle, like a windex bottle, and I use it for castings and ballasting track.

It takes an iron man to play with a toy iron horse. 

  • Member since
    May 2005
  • From: Huntington WEST Virginia
  • 384 posts
Posted by ChessieFan13 on Friday, June 24, 2005 3:24 PM
I have just tried the foil method and it did not work[:(!] When the plsater was almost dry i put it on mt foam and waited for the foil to warm to my hand temp. Pulled back an edge and began to pull it all away. The WHOLE casting broke into about 10 pieces[banghead] Do I need to put alayer of baby powder or some soap or what to allow the plaster to come free without breaking the whole thing[?] Yes this is my first try but I need help[|(]

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