So im following a Martin Gonzalvez tutorial (https://www.youtube.com/watch?v=00h0KFbkViA&t=137s) and i got the rust-oleum Crystal Clear Enamel but mine says for superior coverage and durability while his says for a glossy finish, can I still use it?
It would appear that you have the same exact brand of spray paint that he's using - Rust-Oleum Crystal Clear Enamel.
But here's a question for you - are you using his tutorial to try to make playing cards? Or more specifically, gaffed versions of existing card brands/designs? I'm asking because his card building method is DIFFERENT than that used by most playing card companies. He uses a layer of cardstock sandwiched between two layers of plain paper, coated with this clear paint. Playing cards are often made on "pasteboard", which is two layers of cardstock and a layer of graphite-infused glue in-between - the graphite is used to make the layers opaque when held up to a bright light source. Cheaper manufacturers of pasteboard stock will use materials other than graphite for opacity, or will use nothing at all. "Black-core" pasteboard is typically graphite, while "blue-core" is something else - cheaper and generally inferior to black-core.
In short, if you're just planning on making some kind of game cards for a board game, like Martin does in his video, you're good to go. If you're trying to make something that looks like a real playing card from a company like USPC or Cartamundi, his method in this video isn't likely to produce the results you desire. He says as much towards the end of his video - commercially-manufactured cards will have a much different handling, while his paint-and-play cards are not designed to withstand riffle shuffles and other kinds of handling that most playing cards can take in their stride.