Hi Shimmix, just catching up with some threads and tripped over this one.
Ash is probably not the best timber to be used for a solid colour as the grain definition is very strong and dominant which requires a lot of sealing to prevent the contours showing up later, as was evident on the back in an early photo of the initial blue coats.
I have only done one Ash body in a stain and no experience in solid colours, but it looks like many, many coats of primer may be required to achieve an overall flat finish.
Cheers, Waz