Tony Bebb creating Stones for Root over Rock Bonsai

Notes

For stones used in a root over rock bonsai style, make sure the stone has character.
The stone should also have visual direction, which should flow with the tree.
Make sure the tree is planted in an interesting spot, e.g. not directly on top.
The stone used in the composition should look like a mountain or a rocky outcrop sticking out of the ground.
Some rocks can have too much character, which may detract from the tree.
Conglomerate stones or those with flecks can ruin the image or proportions due to the pebbles in the stone.
The stone should have a visual base to provide stability.
Rocks from the seaside would have high salt content that needs to be removed. This can be achieved by boiling in water on the stove top for ~1 hour or leave out in the yard for 3-6 months.
Seashells can be removed by immersing in white vinegar until dissolved.
Smaller stones can be glued together to make larger more interesting stones. You can build something with stability, height and direction.
Mainly uses Plastibond, but can also use car filler or another all weather glue that does not flex.
Two part glues are useful as you can add more hardener to make it cure quicker.
Use sand/grit from the same sort of stone to sprinkle on the exposed glue areas before it has fully cured to hide the joins.