I've been working on a project where Im staing jars to be used as vases at a local florist, the materials used to stain the jars are not waterproof and the jars need to be sealed inside because they will eventually be filled with water. It needs to be pourable, and dry crystal clear without yellowing. Please help, I've tried about 4 different types of sealers that say "water resistant" but they end up being cloudy...