Originally Posted by generulpoleaxe
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Use lighter fluid instead, it's far far cheaper and does the same job (great for oil paints as well when using small blob patterns for weathering vehicles)
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Depends on how you use the pigments. Lighter fluid works well to fix a pigment wash or just pigment brushed on dry. But, if you apply heaps of pigment to make dry mud or caked dirt or something, the best product I know of to fix it and make it sturdy enough is the MIG pigment fixer.
The fixer is enamel based, so I don't think it mixes well with water.