Thank you Jenkilhill, in that case, I need to find another way to work with this feauture. What I need instead of the "Add to cart" button is some kind of "Contact me" button for these specific products so we can get in touch directly with the buyer and manage the sale. For this products we have to catch the fish on demand, we don´t hold stock.
What do you recommend? Is there a way to trigger some kind of notification each time someone uses the "Notify me" button?