welcome, enjoy!
I have used many products to eradicate mites, the best I have found is SMC xxxx://xxx.spidermitecontrol.com/
Pest off is good and neem oil works best when all hav egone, best is to get your environment under control and you wont get any mites and you get bigger buds. House and garden make a great folio feed that rocks check it out worth the money, IMHO
PS dont know what sevin spray is, sorry.