A quart of paint at 4:1:1: a quarter quart of hardener, a quarter of reducer. Eight ounces at 4:1: two ounces of hardener. Only four ounces of hardener left? A 20-ounce batch. AutofxMart's free Paint Mixing Calculator works out every part of the mix, by the amount you're mixing, by the job, or by what you have left.
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