I'm getting ready to roll my '64 beetle. I'm slowly getting the body ready and hope to have it perfect in a few months. I have sanded down the rusty areas in some places to bare metal. I treated these areas with a product called phosphate and etch. The phosphate and etch inhibits further rusting and also (according to the product info)makes an excellent sub-surface for any paint.

My next step is to prime the entire car by rolling Rustoleum Clean Metal primer.

My question: Should I thin the primer also before rolling or can I roll it straight out of the can?

The reason I want to prime is because I have a lot of filler work that I want to cover before painting. I think the primer will give a good foundation for the paint.