If the fire hydrant is going to be used outdoors then Kilz shouldn't be used. Its a interior primer. For interior use the Kilz Original can be used on bare metal but it shouldn't be used over rattle can paint. If it were me I would just let the paint you are using cure for two weeks and just spray it white again. Just don't put a thick wet coat over it or the toluene in the rattle can paint will bring out the red again. It will eventually cover, you just have to let the paint cure good between coats.
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