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Tips & Tricks
Ask about and post about tips and tricks you use while modelling.
Making rocks
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Washington, United States
Joined: March 15, 2009
KitMaker: 1,502 posts
Model Shipwrights: 58 posts
Posted: Sunday, February 25, 2018 - 04:12 AM GMT+7
Fred, you don't need to go to Bulgaria to buy it, any good fireplace shop or even the big box hardware stores carry the extruded ceramic stone for indoor fireplaces. Might save you an airline ticket. As for pricing, some of those big box stores offer samples of exterior facing fake rock for free, or at low cost which can be used the same way. Here's another old model Railroaders trick (I know you and I are both old model Railroaders-- emphasis on old for me--I can't speak for you!)--you can make a latex mold of this material and cast it in hydrocal (plaster for you non-model RRs out there), so that you can have as many rocks as you need. Model Railroaders frequently use one mold to make 4-5 rock faces by alternating the positions of the casts. On the other hand, this material can be carved itself once heated, but it would be more expensive to buy it that way if you needed a lot of rock (as model Railroaders typically do).
VR, Russ
Staff MemberManaging Editor
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Tennessee, United States
Joined: December 21, 2002
KitMaker: 7,050 posts
Model Shipwrights: 436 posts
Posted: Saturday, February 24, 2018 - 04:07 PM GMT+7
Those are great looking rocks!

I'm going to Bulgaria to get a few bags of these. Like Russ said, US BBQ charcoal isn't suitable.

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Illinois, United States
Joined: December 08, 2017
KitMaker: 34 posts
Model Shipwrights: 0 posts
Posted: Saturday, February 24, 2018 - 03:26 PM GMT+7
This looks like a pretty good inexpensive idea. I'm a long time train guy and tend to use Hydrocal and a handful of molds, your method looks like it would save some cash.
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Washington, United States
Joined: March 15, 2009
KitMaker: 1,502 posts
Model Shipwrights: 58 posts
Posted: Friday, February 23, 2018 - 10:22 AM GMT+7
For those living in North America-- the BBQ rocks Venelin is using (great idea by the way) are not the same as the "Charcoal Briquets" we commonly use here in N. America for outdoor grilling. They are more akin to the ceramic extruded "hot rocks" heat retention rock that we use here in natural gas fireplaces and some natural gas BBQs. I wouldn't try using the "Charcoal Briquets" variety for this-- as they are pretty fragile after use, and before use they are soaked in flammable Kerosene or a like material that can off-gas indoors.
VR, Russ
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Virginia, United States
Joined: May 18, 2008
KitMaker: 231 posts
Model Shipwrights: 207 posts
Posted: Friday, February 23, 2018 - 07:04 AM GMT+7
Nice little dio! Would have been super-cool to see some bloody critter hanging out of one of the raptor's mouths.

How thick of a layer of the putty did you use? did you have any problem with the putty getting absorbed into the styrofoam, and causing an uneven surface?
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British Columbia, Canada
Joined: September 03, 2009
KitMaker: 6,562 posts
Model Shipwrights: 11 posts
Posted: Sunday, September 03, 2017 - 12:10 PM GMT+7
I made this little scene out of Styrofoam covered in Durham's Water Putty.
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Arkansas, United States
Joined: June 29, 2009
KitMaker: 11,058 posts
Model Shipwrights: 9 posts
Posted: Friday, August 25, 2017 - 11:46 PM GMT+7
Very realistic. Thanks for sharing.
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Joined: December 07, 2013
KitMaker: 683 posts
Model Shipwrights: 0 posts
Posted: Friday, August 25, 2017 - 11:25 PM GMT+7
I don't know if this was posted before, but I read about using barbecue charcoal for diorama rocks, so I decided to give a try after a BBQ evening several days ago .
It's simple-pick up some charcoal pieces, spraying a primer (in my case Vallejo polyurethane one), then base color depending on the desired rocks and then with dry brush lighter tones.
I think the result is very cool and realistic, and the coal is more lightweight than real rocks, which is advantage