Baggiebird those dash pics are exactly what I needed and whilst fitting the dash is a long way off, the car needs a new dash top rail so I need to make sure that any mounting holes are drilled before paint. Thanks very much for your help.
Sanded the weld down across the boot floor and primed it. Didn’t go mad with sanding it down as I intend to come back to this later. I'm thinking of ways of hiding the joint.
Spot welded the valence to the closing panel
doing this enabled me to gain access here
The problem is, the second you weld, you have rust. Whilst etch primer is good for clean metal, it's not good enough to spray over rust even if only very slight. I cleaned off all of the black celly & weld through primer with thinners. Then wiped it down again with panel degreaser. I then sprayed thinned down zinc primer in and flooded it. This was followed by a good blast of air using the spraygun to force the paint right into the seam
This is the other side of the seam where the zinc primer was forced through
Once this is dry, I will do the same to the other side and force the zinc primer the other way up the seam. This should ensure decent coverage.
It seems to me that the weakest point on a Mini shell is rust in the seams and there are plenty of em! I'm also thinking of ways of fully immersing the box sections in wax for added protection.
Thanks for looking and again for your help baggiebird