Hi,
This may not be that helpful but I got some treatment from a firm in Scotland a few years ago so can't remember details but they sold it on ebay.
It came in a plastic disolvabe tube and you mixed it with water.
I suited up and face mask etc and spray it with a presurised garden spray.
I am sure it was the same chemical that you mention but of course much cheaper and they posted it to here no problem.
Treated the Vegas after with linseed oil that was about 30€ 5 liters. Seemed to do the job ok now 8 years .
Good luck
Steve