As a high school IT teacher without the necessary equipment to apply finish by spraying, I am bound to simply using the brush application. Using mostly polyurethane, I have seen in another district that they used rubber jar sealers that brush handles fit into and then could seal the brush into a common mason jar. This sealed up the brush and the polyurethane and it sealed up the brush, thus leaving a lot less cleanup and fewer brushes that are used at my expense. I cannot, however, find these "brush/jar/sealers" in any retail store or website. I know that I can wrap the brushes up, but this seemed less handy and clean. Does anyone know this product that I am referring to and any idea where it can be found?