For my lower control arms I didn't blast mine. They were in good shape and I soaked them in evaporust and then coated them in Eastwood's Exo Armor.

Since they are a stamped steel they still have a smooth finish and blasting them would have given them an etched look. Allot of guys paint them cast gray, but they aren't a cast part?

For the cosmoline I used Krylon battery protector spray