I use lemon extract to paint with. Or some type of white liquor. I've also heard of some people piping the letters on and then painting over them. Some have also used fondant. I paint mines though and believe me, it's time consuming. I wish I had a better technique 'cause I've seen some unbelievable realistic LV cakes without the raised letters.
What are you mixing it with? I usually use vodka as the liquid evaporates fairly quickly. If I add too much liquid, I just wait a while and it thickens on its own. If I'm in a hurry I just add more dust until it reaches the right consistency. It really only takes a tad bit of liquid with the luster.
Hope that helps!
-Michelle
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