I don’t know how to do it when I am using visual composer. I have other problem when I put a product. It doesn’t apear like the demo with gallery mode. The products I have to put have different images, but only appear the featured image.
In home page http://www.carritosdechucherias.es under slider revolution I have 3 main products, each one with gallery images. The problem is that don’t appear the images in each product, only the featured image.