Glad you were able to get it fixed up. Adding a large secondary air tank will help immensely with sandblasting. Your gonna wear it out quick on this bike. Be sure you degrease the frame with a good degreaser so you don't run into paint problems. I like POR's engine paint kit, used it on my 66 Volvo 122S motor and once it cured, took a while, it was very durable and kept its gloss. It wouldn't be good for an aircooled motor as it goes on pretty thick but it has excellent coverage and is a very high solids paint.
I had mixed results with POR15 rust preventative paint, very important to properly prep and for the metal to be clean and dry. High humidity plays a role, not always a good one.
Not familiar with that paint...will have to look at it.
Good luck on the continuing build...enjoying watching it come along. Lots of sweat equity being invested in this bike.
This bike has the VB version of the Kiehin CV carbs? I have the VB26Bs on my CX500