I used nothing when I ream bronze bushes. I also took very light cuts to not stress the reamer. I use a very good reamer with pilot.
For Vesconite I use a cheap reamer with pilot that is preset.
I like Vesconite!
I also like DEVOL using Bill Beck's information as to clearance. I have a spare set of Devol bushes. Have replaced the KP's but not the Devol bushes. At 50,000 miles. Devol hold grit that damage the chrome on the KP's. Use seals and gaiters.
Always use Hard Chrome, never Stainless.