Yet another FOODIE Question - Stabilizing sweet white wines.

[wineseven]

Yet another Foodie Question - Stabilizing sweet white wines.

In process of fermenting late, late harvest Sauvignon blanc with Botrytis to achieve sweet white.
Started at Brix 36!, 18.5% potential alc. Now, despite the yeast's manufacturer claim that it will suck at 13% max., the wine at 10 Brix, 15.5% alc. - the fermentation raged still.
So I ripped off all the shelves from my fridge to create place for the 6.5 gal. carboy, racked the wine off lees and stopped the fermenting at the temp 35°F.
I KNOW IT WILL START FERMENTING AGAIN WHEN THE TEMP WILL RISE. HOW DO I STABILIZE THE WINE?
PS: There is no So2 added at the crush.