Things are getting a little "rocky" around here.
After I greened up the place a bit, I REALLY want to start molding some rocks.
I use homemade molds that I have made over the last 18yrs. I use liquid latex rubber and gauze over rocks to make them. You want to find rocks that have a lot of texture(nooks and crannies). They show up much better and more realistic to scale in HO.
Mixing the plaster is a similar process as when I did the paper towel soaked covering over the cardboard webbing. I just mix it a bit thicker then the paper towel mix. This time I used Plaster Of Paris (POP). I need it to be strong and set up quickly. I have always use POP instead of hydro-cal mainly because of $$$. I like to add a grey Tints-all to the plaster to help get the finished color where I need it to be. Don''t be to afraid to add a lot to the batches, it dries lighter then what it looks like in the wet stage. In fact, I wish I made mine dark to start after seeing it completely dry. If you're not happy with the color, you can always darken it with washes of diluted tint.
Once I mix the POP I wet the molds I'm going to use with "Wet Water" (water with a few drops of dish soap in it.) It helps the plaster release from the mold, achieving sharp lines that look like jagged rock.
Fill the molds well and let the mix set up for a minute before applying it to the hardshell. I like to do 1 large mold or 2 small/medium molds at a time. Whatever your hands can handle. Also wet the surface of the hardshell so that the water isn't drawn out of the POP to quickly. That could ruin the mold. Once it has set a bit, press the mold onto the hardshell and hold it there for a minute or 2. (patience
) Be sure that the edge all around are making good contact. If the POP oozes out don't worry, you can chip away the excess once the mold is removed. SAVE THE CHIPS!!! They can be used for rubble at the base of the cliffs. Makes sure to color them the same as the finished rock so that they don't stand out like a sore thumb.
Below is on of the molds in place after a couple minutes.
Once the POP has setup for about 5-7 minutes (this varies depending on humidity and temperature) start to peal the side of the mold up all around. Then you peal from one side to the other. If you get any resistance or if it looks to wet still STOP... let it setup another minute. Then finish peeling off the mold. If some of the mold falls off the hardshell don't worry, you can always add a smaller rock mold in that place or... COVER IT WITH A BUSH!
Here's an area with a mold in place and a few just completed rocks.
Don't worry if the rocks don't have exactly the same color tone, Mother Nature's doesn't either.
I evened out some of the color differences by spraying a wash of diluted Tints-All across the whole area. After that spray is dry I can either darken it up some more or start to hi-lite and shadow the surface of the rocks. This will really bring out the texture of the molds.
Here's some photos and a
VIDEO of the area.
And finally a couple overall views of the area I scenic-ed on the last trip.
I can't wait to get back down to the layout to add more scenery and trees and bushes to this area.
Again, thanks for checking this out.