I bought a ceramic glaze that says to apply to cone 04/06 bisque and fire to 5/6 glaze fire, can I apply this to cone 6 bisque?

I bought glazes not realizing that the instructions say to fire to soft bisque (cone 04/06). I already fired my pieces to cone 6 (it’s a speckled cone 6 clay), will I be able to apply this glaze and fire it to cone 5/6 again or will it ruin the piece? 

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