Boiling point / pressure
Boiling point depends on pressure. Drop the pressure to about 0 and the boiling point is about 0K (-273°C). In vacuum body heat will boil any liquid: blood, urine and this magic gel. The good news is that boiling things requires energy. As liquids boil away they take heat away from where they were. The temperature of your gel covered astronut would drop until the liquids froze solid. That would not stop some of them from subliming (going directly from solid to gas). Sublimation would continue but slow down as the temperature dropped. Freeze drying is an effective method of preservation. If you returned your freeze dried astronut to a warm pressurised environment much of the appearance, texture and taste would be restored.
Biting the hand that feeds IT
