Quick question

[J-A-X]

I use acrylic render - its cheaper and strong than grout, a 20kg bag cost me $14 last weekend from bunnings. Just use oxide / cheap $2 hobby paint to color the last layer. You can smooth it off if you don't want a rock texture. Then use the same $2 paints for highlights then seal.
I keep black, brown and sandstone oxide on hand, it delivers all naturally found rock colors when used in different strengths and combinations

The DIY group has a discussion on "foam work for all" but if you still have questions feel free to pick what little brain I have left

 

[KRONYK94]

okay awesome ill go down tomorrow and grab some render! pumped to get this done!

thanks jax you been a big help

 

[J-A-X]

You're welcome, PM sent with a bit of additional info

 

[J-A-X]

Did you get chance to play today ? It always reminds me of making mud pies

 

[jahan]

Chris has done a good job of it.
I hope you put some pics up Chris.