N2O4/UDMH propellant are what is called hypergolic.
The moment N2O4 & UDMH in touch with each other that they will burn spontaneously on contact.
It beggars belief how that can ever be turned converted to gel other than in the peculiar universe dbc found himself to be in.
Perhaps the threat of negative rating dbc give to N2O4/UDMH make them frightened with fear that they could be gel together.
dbc must write a paper and win accolades as to his chemical expertise of gelling N2O4/UDMH
There are many papers on the subject of gellation of hydrazine particularly on the widely used UDMH Unsymmetrical dimethyl
hydrazine.
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