Always seal any weathering you do.
You shouldn't need to use as much as you think in the pigment, unlike the fuller's earth (which is just powdered clay). those 30ml bottle can go a long way, as you can mix them into a paste to get greater control ( it will dry to look like powder again) or dry powder on raised areas to gain definition.
As long as you get the pigment and not just weather powder, as weathering powder is premixed pigment with a medium.
If you do want fullers earth, try health shops, they sell it for mud facial washes or the like, some shops should have different types of clays also. E.g. Fuller's Earth 50g - Buy Fuller's earth from our UK herbal shop at Woodland Herbs
Also try you local Art supply shop, as they should have powder pigments or the like.
