Because I’m a careless moron the bottom third of the poptop was covered in grinding dust. 

I couldn’t remove the dust with a fingernail so went over the affected areas with some wet and dry, followed by 3000 wet on the DA over the whole roof (first time I’ve been brave enough to machine colour sand, figuring the roof isn’t easily seen should I screw up):

After buffing and waxing it looks miles better:

With the help of some of the lads down the yard the poptop is now back on the van and out of the way:

Second corner now cut and polished, with both rear light clusters and engine lid seal in:

 And before I forget, I put this stubborn little devil in. The fuel breather hose tucked up the left corner: