My dad and I prepped all the pieces in Section 17 and Section 18 that have been fitted for Alum prep and Alodine process. We did the Section 17 and 18 pieces prior to dimpling the skins. A couple hours later and we had completed our job but had difficulty in applying Alodine to the fuel tank skins. I will research the process and see if I can’t get it accomplished prior to assembly of the fuel tanks. No pictures