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mespilus
I don't know if anyone recalls my parquet experiment?
The results are in: all three blocks (stripped back/partially covered/totally covered in bitumen) are bonded to a level I'd quantify as "really fucking stuck".
To recap this was the cleaned up brick:
Partially covered:
Edges squared off but otherwise left:
Bonded with Sikabond 5500s they all seem to be stuck equally well - I'll test more vigorously, but I tried quite hard to get the final/most bituminous block to come away (with my hands) and failed totally.
So - I shall square up the rest, but I'm fucked if I'm scraping all the bitumen off now that I've proved it's not needed.