The second coat of hi build has been applied.

So far all up I've sprayed 8.5 litres of hi build primer over 2 coats and spent 18 hours wet sanding.
Up close the hi build is now so thin it is almost translucent and the shop floor is covered in white powder.
It did screw with my head just a little, all that money and time to put the primer on
just to spend a lot more time to rub it off. However the hull is now nice and smooth and fair.
Next is to spend some time cleaning up the mess so I can apply the top coat.