Hi @jamesbisset, I’d you’re doing a tester it might be worth trying the black thick ca glue from O3 adhesives.  https://www.o3adhesives.co.uk/products/o3a-cyanoacrylate-adhesive-black-medium-thick-50g?variant=41533207117921&mc_cid=282794db2e&mc_eid=281c11eb3c I’ve not used their black, but their clear ca is good, as is the accelerator. They’re a UK brand,…   Read more»