I have learnt to make layers of glaze thin to begin with. This is what happens if the glaze is too thick. Prussian Blue oil paint on aluminium. But I can use this as it is a good ground to work on and layer up with more glazes.
When using a bought primed canvas do not size and gesso the surface as it will crack and the canvas becomes very taught. Just paint directly onto the canvas. On this large canvas I put a number of layers of a blue grey. Today I have put a thin white wash on to try and knock the colour back. I will add another wash when dry. I used a large brush and went against the grain for an even coat. I am going to add more layers of white glaze to then experiment with a Prussian Blue and Alizarin Crimson glaze. Keep following to see what happens.