Akemi's Marmokitt 1000 Transparent is a polyester/resin based adhesive that is available in Flowing or Knife Grade.  The Flowing adhesive is honey colored and is used for filling, patching, and mending natural and cast stone.  The Knife Grade adhesive is also honey colored and is fluid when stirred or shaken but returns to a more solid state when standing, making this a good choice for vertical surfaces.