Chalk paint sealer

Im in the process of building a double wide craft/bookcase cabinet. It recommended painting before putting together. I will never do that again. I am using rustoleum glaze too. I absolutely love it. My question is I cant seem to find the matte finish sealer anywhere. Today at Menards they said they're having problems with rustoleum and their shipping?? Please advise me. Can I use another product?? This is especially made for chalk paint.