this one slid into my feeds this morning:
https://interak.tv/tank-sicaran-blood-angels/
Quite a comprehensive guide for achieving a finish that is somewhere between 'Eavy Metal and trad. military modelling style. Reminds me those Forge World modelling masterclass things, except maybe not as extreme? Disclaimer, features almost exclusively AK interactive products..
The appendix of the PDF tutorial also has some extra tidbits regarding general techniques etc