HEAT SPOTS ON ANODIZED ALUM EXTRUSIONS

I'm assuming that the heat spots you are referring to are due to the heat generated during the extrusion process?

Do you have a picture of the problem?

Have you tried annealing the part after extrusion?

What alloy is this?

What is your anodizing process?

I did a quick Google search and I keep seeing recommendations to increase the cooling on the runout table.