I use plaster.  I mix it up thin, and smear it on the surface.  Then I wipe across the grain with a damp sponge.  Works for the chipped stone.  Field stone I use a proper putty.
It usually takes two applications because of air bubbles. Works great but will ruin the sponge. 
Snitchy sends.



That old chair in the corner has my name written all over it.  Wink


Tip: A bottle of scotch and two aspirin daily will greatly reduce your awareness of internet trolls.
http://snitchythedog.blogspot.com
Molds
40, 41, 42, 43, 45, 46, 51, 53, 54, 55, 58, 59, 61, 63, 65, 66, 70, 74,  85, 90, 95, 204, 210, 250, 278, 279, 301, 302, 303, 321, 325, 326, and 327