
In ye olde days of my metallic painting, I would paint the base coat over black, then layer it like I would colors, or maybe drybrush each new lighter silver over the next. While drybrushing definitely speeds up painting metallics, I never really cared for it.
The early stages of this goal can be seen with the Super Dungeon Explore Iron Golem, which looks great, but the way I went about painting him took forever and I need to speed up the process.

A few months back I decided to try painting True Metallic Metals (TMM) as if I was painting Non-Metallic Metals (NMM) and painted Shojo's metals with it. While it didn't turn out exactly how I was picturing in my head, it laid the groundwork and I used what I learned there for the Iron Golem.

Another issue I have is that the darkest metallic paint from Citadel, Leadbelcher, is actually not dark enough to give good contrast. If you start with a Leadbelcher base coat over everything with a Ironbreaker highlight and a Stormhost Silver spot highlight, the final highlight sometimes gets lost.
That said, I now mix Leadblecher and Black together to make a darker metallic to deepen contrast.
The other problem is, since Leadbelcher is a metallic, the shadowy areas will still shine, hiding details a little. Of course, if you are drybrushing the deep recesses still have black in them and it helps show the details.

Taking what I learned from Iron Man's armor, if I blend in black to the recesses and under areas, the shine will go away and the shadows will deepen.

That's when I realized I can use the Citadel 'ardcoat gloss varnish as a spot gloss and add it to only the highest highlight areas to make them really shine. I've done this on Brave-Mode Candy recently and I really like the result.
Now the goal is to bring it all together on this dwarf and over the course of the year tweak it and improve it until I have TMM down and looking amazing. The biggest hurdle for me has always been blades and I need to really work on that.
So far, the dwarf is looking solid, I haven't finished his armor yet though. Once the silver of the armor is all painted, I 'll start adding dings and scratches to it. I'll take what I learned there and translate it into bronze and gold too.
Here's the dwarf as of the other night.