Rustoleum Countertop Clear Coat. Multispec Countertop Clear is a two component solvent based acrylic urethane engineered to be used with Multispec water-based multicolor finishes. So unless Rustoleum themselves make a clear, I think you're out of luck.
If that's the system you used, there'd be absolutely no advantage to applying a coat of poly over the clear protective finish.
So unless Rustoleum themselves make a clear, I think you're out of luck.
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This product is suitable for DIYers. The first can is the black top coat, a thick gloppy substance that resembles tar when it goes on. Rust-Oleum Countertop Coatings contains HomeShield Antimicrobial Protection to inhibit the growth of mold and mildew.