This point alone is bad enough. Lets not talk about application wise since this might be considered secondary to some. Primarily, styling products are used to make you look good, well groomed. However one important point - it has to be washable, or at least reasonably washable. But IMO, gatsby does not fulfil this point at all. So consider this question. Are you able to accept a product which u cannot wash off easily at the end of the day?
Its like makeup. If you are unable to cleanse off easily when you got home and stains of makeup are left on your face, are you able to accept it? Though hair is not part of our skin, but once damaged over time, the ramifications are far worse off as effects are considerably hard to reverse.
Sharing my personal experience with Gatsby (both purple and grey moving rubber). I didnt start out knowing about hair products and like many, my first went to Gatsby. Not long after,, i began to realize that its hard to wash it off and my hair is never clean after shampoo ing, even so if its 2-3times consecutively. I was using heads and shoulders back then. Foolishly enough, i ignored it as i couldnt really do anything much about it. Changing shampoo didnt occur to me as to me, shampoo is just shampoo. Nope, no conditioner too. It was until my salon stylist said that my hair is dirty and i began to realize that there were a high amount of hair fall (hair strands) in my bedroom. Then i began to switch to other products and shampoo.
So if you are still thinking of using Gatsby for whatever reasons, please feel free. But please do yourself a favour - use a good shampoo to cleanse. Gatsby is like eyeliner which is hard to remove. That cannot be removed entirely by normal make up remover and has to be done by eyemakeup remover. To me, Gatsby failed as a product because it failed to help the general group of consumers utilise nett benefits, when using it recursively.