Mr Towed, Blooka & Scottie - Thanks chaps.
I've started a new thread to explain what I
should have done.
And I really must give full credit to the DVLA for helping me out of the hole I dug for myself.
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Making A Bit Of A Mess:
Managed to crab a quick break in the weather and sanded down the filler on the boot lid.
I did both the top surface...
And the perimeter edge on the inside that the rain channel seal will press against.
Once again it was pretty cold outside, so I added some extra hardener to the body filler.
But this meant the filler was setting before I really got the chance to get a final smooth surface.
I also ended up using up the last of one tub of filler, before starting another tub of a different brand.
The net result is certainly not pretty.
The only good news is that I know my sanding block set will work wonders on this.
Unfortunately it is raining again here now, so I am not sure when I will get a chance to start cleaning up this mess.
Cheers, Paul.