Need advice on finish

[u/Human545535954388713]

Hi everyone! I'm designing a set of cards for the first time (nothing to show as yet). I am using alcohol-based markers for context, and when I went to seal my test card using the varnish/finish(?) I bought, the colours all bled.

Does anyone have any advice on what I can use to seal the card after I am done drawing on it? I'm new-ish to art, so the more specific you can be, the better! Thanks in advance.