That is a real shame when there is little or no support when a problem is encountered with a product. I know I am very leery of using any paints I am not familiar with. When I had problems with a molding compound I had used for a few years I called the company and they were on it right away and communication was almost over the top. In the end they pulled all their stock of that product as something was done wrong in the mix. They sent me free a replacement after a new batch was mixed...AND THAT IS HOW IT SHOULD BE!
These paints were recommended to me for my current project but now I will really have think about that.