“...in the UK, they have had years of acid attacks...”
How long will it take for some Antifa goon to add acid to their already toxic milkshakes? It’s coming, unfortunately.
Acid would neutralize the quick-drying cement, which is alkaline.
There’s rumor of them planning to use balloons filled with nuriatic acid at a Free Speech Rally coming up in DC. The speakers will be all those people who have been de-platformed by big tech.