Double gloss

I just shot a thin gloss over some highly intricate acrylic artwork. I remember Cleanlines talking about a double gloss and I’m thinking this would be the ticket here. Do you think the single gloss will be enough to protect the artwork? For a double gloss, do you get rid of the rail bead and what grit should be used before the second coat? Keep in mind, I simply CANNOT go through to the acrylic! Thanks- Its