Problems with Hobby Lobby paints?

Just wondering if anyone else has ever had problems with paint from Hobby Lobby? I picked some MM acrylics once before and they were a big blob in the jar. The other day I needed some OD and thought I would grab some while I was there. Somehow an enamel jar got into the acrylic bin and I did'nt catch it till I was home. I tried painting with it today and it seemed like it just did not want to work right. Was very difficult to spray with. Just wondering if there was a shelf life on the paints or what. Thinking I am just going to stick with Tamiya stuff and just have to wait until I can get to where they sell them from now on.