Jay, Tower Hobbies has Top Flite LustreKote paint that is fuel proof and it will match MonoKote covering. It sells for $6.99 a spray can plus shipping. Some local hobby shops also sell it. One can should be enough to do what you need for the stick. Years ago when I was flying glow engines, I think Rust-0leum paint was fuel proof. You might try spraying on some balsa, allow it to completely cure, then spray a little glow fuel in a spray bottle on it. I never used it myself cause we had fuel proof paint.
Rich