Can you fix an Engine Mount with Window Sealant?

In the progress of Building my 1984 Single cab T3 (Vanagon), I'm going to try to fix the worn out transmission mount with windshield sealant. If this works this could be a way to stiffen up your existing rubber mounts instead of going for the more expensive and also harder polyurethane mounts.

Видео Can you fix an Engine Mount with Window Sealant? канала Ollari's Garage