anyone have any tricks? It get very cold were I am, -50 sometimes...every oil/paste base I have tried seems to quit at -20 or so...tried vaseline, peanut oil, glycerin...sardines in soybean oil and noting seems to keep smelling when its cold

Some ideas...
A few guys have been playing with BLACK colored lures to utilizes the sun rays to heat up the lure and get the skunk odors active.
Lot of old timers claim that peanut oil will allow a lure to stay active in cold weather...I see you know about that...stick with it and experiment a bit
Chunks of bait that the birds can get to might create enough of a mess on the bottom of the tree to "call" marten to your trap site.

-20 to -50 temps are brutal not sure any lure can operate up to full potential in those extremes??
Be careful

M a r t E n : Marten

Martin is a bird.
Ie : Purple Martin

Even in French Canada it is : m a t r e

Super Lube Grease don’t freeze until -45. I use it as a base in my call lure, never had it crust over.

I have to override my spellcheck to spell it correctly. It will time and time again correct my spelling even when it's right.

My impression is that since glycerine is pretty much non-volatile but stays runny in very cold weather, it creates a scent-proof film on the surface of the lure dab when used as a standalone base/solvent, and in wet weather, it washes off because glycerine is water-soluble and actually draws water from the environment.

I don't know if my idea makes much sense, in terms of surface tension physics and such, but I thought that an emulsion, i.e. a mechanical mixture of polar (water-soluble) and nonpolar (grease-soluble) substances with different volatility would ensure that one way or another the lure will have enough holding capacity for various volatile substances not to lose strength fast, yet those substances will be able to make it to the surface and beyond in any weather, including cold spells, rain and freeze-thaw cycles.

I use a mixture of sun-rendered oils, glands, glycerine and vodka-based castor tincture in my sweet marten lure as the base. To make it homogeneous, I use emulsifier, and add a pinch of thickener (guar gum) so that it's not too runny and has some volume. For very cold weather, I add maybe 1/5th more castor tincture, by volume, directly to the small jar that I take with me.

The lure stays soft at -20F and below. I think it works well. It stinks, everything it touches stinks, including myself, and marten get caught.

you can try cat fish cream mixed with beavertail oil what ever you smear it on the only way it can be removed is to be chewed off i still add glycerin
but when the set is finished i use a small pocket torch to scorch the paste

Tatiana,
Based on where you are, how close are the Marten you catch to what people refer to as a 'Russian Sable' ?
I've seen Marten caught along the NW coast of Alaska, that were extremely dark, with nearly no throat patch and very silky.
Unlike most of the ones here caught throughout the main land of the 'Lower 48'.

The ones in your photo seem similar, but there is that one, which appears a lot darker.