Vaniqa is ONLY for female facial hair - not arm hair. It is expensive and you have to apply it 2 times a day, for female facial hair. Arms equal a larger area. You could contact the people who make Vaniqa and ask them about using it on your arms,I suppose, but that is not recommended. www.Vaniqa.com
Why not find a speedy electrologist to thin the hair? I’d find someone who uses MicroFlash or PicoFlash thermolysis and nothing less. A couple of laser treatments maybe? Can you upload a picture? It is hard to advise people without seeing their problem.