I had ordered two 4oz containers of Bioshield Aqua Resin Stain Finish #33 (walnut) for a customer who specified that I use this product for his yoga props. Upon receiving them, I found that both containers had leaked in transit to the point that I was unable to read the labels. I replied to their shipping notice email that the containers had leaked but didn't get a response. After about ten days, I sent another email. This time I get a response right away with instructions to use or discard the leaky ones, that new ones are on the way. When the replacements arrived, bagged separately this time, only one had leaked and only a little. I haven't yet used the product so I have no opinion of it but I'm content with the customer service. I think the plastic threaded-lid containers are just prone to leaking.