Im doing an oil painting in my first gesso base. I've taken a piece of wood, very solid and smooth, and painted it with 4 layers of acrylic gesso. The surface got a nice texture. But when i, for exemple, scratch the surface strongly with a nail, the gesso gets off. Is that correct? what did i made wrong? Also, is different to paint in gessoed board? because i noticed that the paint gets more transparent and thin over the acrylic gesso. I took some photos to show you. I made a orange underpainting for the blue sky...after i painted the second layer, the blue, you can still see some orange spots where the painting didnt "fixate" to the board... ist that very wrong?
Im sorry for the english, i hope you can understand.