I've used this several times to get rid of leftover paint from the previous owner of a house we bought a few years ago. I've used it on glasses that were partially or fully filled. What I've found is that this stuff works, but it 1.) requires a lot of it to work, for a full 1 gallon of paint I had to use two packs, even though it says each pack works 2/3 a gallon of paint , 2.) It takes a long time to work: you will stir it for quite a while before it becomes lumpy/hard. I haven't tried Homax yet but I've read that it works better and I'll give that a try next time I need to get rid of paint.
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