I like Duragloss #271 rubber and flat black dressing. Its easy to use like all their products. It both cleans and treats the surface at the same time. I know you said you didn't want a dressing but I think this product is still a good choice.
I also applied CarPro CQuartz DLux today. For obvious reasons I cannot comment on the durability, however the until look is fantastic. Judging from other reviews I think that it is one of the more permanent solutions on the market. Depending on how bad your initial trim is, however, may determine the quality of the restoration. I was applying on my car today as a preventive measure. The real test will come next week or so when I try to restore trim on my weather beaten Range Rover trim. Will post a thread when I do it and have pictures.
Only downside is cost, but DLux is cheaper than many other "permanent" options out there.
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