Is gesso the only product suitable for priming?
While GOLDEN White and Black Gessos are specifically made to be used as a primer, other products can work as well. GOLDEN High Load Acrylics are in a sense colored gessos. Instead of using the standard Titanium Dioxide Pigment, they are made with another pure pigment, such as Ultramarine Blue. The HLA’s can be used to tint Gesso or mixed in any combination with each other to create a unique ground. They work quite well as as an underpainting, providing adequate tooth for any paints being applied over them.