This paste is designed to increase abrasion between surfaces. Apparently a dab of this can help prevent camming-out of screw heads.

Chemico Valve Grinding Paste 100g Fine & Coarse Grade + Lapping Stick Tool Set
5.0

CaplinTec Back Lapping Paste | Oil-Free, Odour-Free Formula for Precise and Efficient Maintenance | Superior Performance for All Equipment Types (80 Grit,...
4.0