Ken,
We used to paint the lifter galleys of our race engines with a type of paint to get the oil to slide back into the pan faster and not pick up as much heat. And to "trap" anything after we had machined the lifter bores and oil return holes and such.
It was a rust red color. But with old age and time, the name of the product slips my mind. (what's left of it.) I think it was a Rust-O-Lem product.
You might ask around at the local hot rod shop or even do search on the web for it. Maybe "engine lifter galley paint".
There are probably better products now as that was some 25 years ago.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)