The two like bodies are repulsive this way,
and two unlike bodies are attractive this way,
And when two negatively charged bodies are brought closer,
they attract each other and stick.
a negatively charged body is the result of surface property. If this is possible, two of these will attract each other, initially. When brought closer, the surface charge flip and they repel as in the very first case. Normally, two negative charges are more attracted to each other than one positive and one negative charge pair, (\(-1.49824\) vs \(1\)).
If this is so, applying another dielectric (eg. alcohol vapor or other volatile oil) onto the bodies will change its charge attribute without discharge and recharge.
Good night...