You can use different oils (linseed is a popular one) or turpentine if you want to thin it, or white paint if you need to lighten it.
What if you want to thicken it to create texture?
All sorts of stuff I’ve used plaster, polyfilla, flour :)
@Light_EDDed started
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You can use different oils (linseed is a popular one) or turpentine if you want to thin it, or white paint if you need to lighten it.