I used to use that stuff... It worked great, just had to keep in the dip to around 5 mins or they'd start to turn.. I always rinsed with boiling water and set them, spread out on a towel over a heat vent for drying...
If you use that I might suggest buy a brass cleaner cloth(its treated with a brass cleaner concentrate that would take off ALL dirt and discoloration, so use gloves), as an added tool ..
Just do all your sizing and trimming before the dip and you'll be fine...
As for the hazmat fee, never heard of it and didnt have to pay it when I bought mine..
My sweety bought me a tumbler last christmas and I LOVE IT !!
Tux