paint color techniques for limestone rocks - Model Railroader Magazine

Here are some photos of the technique I discussed above.

Photo 1 - Bridge, built by my friend Mike Santos, in place for a test fit.  Mike makes these bridges commercially too!

Photos 2 and 3 - Lower portion of mountain constructed with foam core (before strenghtening pieces were added to lower postion of foam uprights) and commercial, foam castings from Scenic Express.  These were cut apart and blended together with Scultamold (ignore drip in foreground - occurred before decision to document this process

Photo Photo 4 - rock castings painted with white latex paint to seal and give castings uniform base color.

Photo 5 and 6 - Rock castings painted with a thinned latex paint (40percent paint, 60 percent water) that I used for my dirt and rock castings. 

Will post more photos after ink wash, tinting colors, and drybrushing are applied. I think this technique makes the rocks take on a natural tone. If you just paint the rocks with full strength paint, they tend to have a "dead" look.