Applying weathering over MM metalizers?

[MillenniumFalsehood]

So I'm working on a set of engine parts and I've base-coated them with MM metalizer lacquers. I am working them into a really nice metallic sheen, over which I plan on putting on some weathering in the form of a grime pass using Tamiya acrylics and an oil scrub wash that's been thinned with odorless turpenoids. But mixing paint types can be tricky, plus metalizers are notoriously delicate, so I'm wondering if anyone has any tips for ensuring that my well-buffed surfaces don't get ruined in the weathering pass (y'know, other than the intentional bits).