Yes, by all means. This is a method to make the needed custom numbers and letters that are not available!
We recommend using a brush-on, water-based clear gloss.
Sprays contain a propellant that is usually solvent-based. Solvents have been known to eat away at decals. We recommend using the brush-on acrylic gloss varnish. Apply to a small, test area first to check for compatibility.
The best method we have found for removing dry transfer decals is to press a piece of clear tape onto the decal, rub with a burnisher or dull pencil, and then peel off the tape. The Dry Transfer should come off fairly easily, but it may take a couple of applications to remove it all. If there are spots of decal remaining, soak a cotton swab in denatured or isopropyl alcohol and rub over the decal. The remainder will come off easily.