It is definitely ok to skip the sanding step in some cases before you paint piece of furniture. However, before you skip the sanding step, here few things to know: Is the Surface Shiny? If the surface is very smooth and shiny, I would hesitate
Paint Paris Gray over gold frames and let them dry really well. Sand with a wet rag and then use a coat of clear wax and then a coat of dark wax. After coating liberally with the dark wax, take an old t shirt and dab some clear wax on it, rub over the dark wax to take off all the excess. The result is amazing.