Like Ken (kanawha) I've gotten mottled finishes with Dullcote as well. Pretty much stopped using it. Over the years, I heard a lot of people talking about Dullcote, and it seemed the product of choice, but when I started using it maybe 4 years ago, I frequently got mottled finishes, at least on plastic. I've used it to dull colored tape, for example, and it worked OK, but I won't risk using it on plastic or over existing paint anymore.
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