I'll go with Jason on this, Tiranti have a very good service and a wide choice of metal powder fillers.
Whatever you use if it has an epoxy resin as the binder it will be hard to sand so try not to overfil to much, it's not so bad on bowl and platters as most of the excess can be turned level with the surface before finishing.
Many thanks for the help, guys; I think I'll be going the Tiranti route.
What sort of resin and hardener will I need? There seems to be such a wide choice. I'm looking to create something similar to Lin's infilled frames here, only using a resin to infill instead of sand. One day, I might try to mix coloured sand with resin but I think I'm a long way from that at present.
Gill, Just another thought to add to the list. Have you ever heard of "Envirotex Lite".........Its a thick clear resin type liquid that dyes can be added to and poured into a area and let dry. It is used a lot for suncatchers I think. The "Envirotex Lite" itself can be found here in the states at many of the larger hardware stores and online thru "Dick Blick" plus many other outlets I'm sure....I think I saw it on the "Scroller LTD" site.......The dyes I finally found at a hobby store called Micheals......Figure they can be found elsewhere also. Just another thought for you to check into.
Now I'm getting spoiled for choice and I'll never be able to make up my mind what to do ! Apparently, Envirotex Lite is available in the UK through Ian Clarke Coatings, although there's no mention of the pigments that can be used to tint it. I'll have to enquire further.