Similar, I have used clear acrylic spray from Toolstation and Halfords, inexpensive and works. Can't really tell the different brands apart. Thin layers, 20 minutes between each, de nib after the first. Let it fully harden for a few days before full-on use. I've also used Plasti Kote Matt to good effect (Toolstation), and Plasti Coat clear sealer which is higher build - takes a bit longer between coats but gives a very deep shiny finish, bit 'artificial' for my taste but it has its place.
Of passing interest, my spray booth. Masking tape on end of chuck, clamp shoebox into place which keeps the spray in and dust off. I find running at about 250 whie you 'puff' the spray can and then running up to a higher speed for a minute avoids any runs, go get a coffee then come back and repeat.
