They look very nice. You've learned the basics and then some at your new job.
As far as Drylok, the stuff is cheap and does make for a durable and water proof finish. However, the surface is highly textured and is not the easiest to clean and it is also not very attractive.
I sealed up an old plywood bearded dragon cage with it and then topcoated with some flat black paint. Made it look a heck of a lot better but it's far from the most attractive finish. I think it would detract from the beauty of your cages.
I suppose you could use it for your personal cages but I'm not sure I would sell them that way. If it were me I'd sell them unfinished and maybe list Drylok as an option. Have one display cage with a nice and high end finish but leave the finishing to your customers. It would save you a lot of time and your customers a lot of money.
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Currently keeping:
3.5.5 Gonyosoma oxycephalum (Javan, mixed colors)
0.0.3 Rhynchophis boulengeri
0.2 Lampropeltis triangulum multistriata
0.2 Lampropeltis triangulum gaigeae
0.0.3 Rhamphiophis rubropunctatus
1.1.1 Morelia viridis (Aru & Merauke locale types)
1.0 Morelia clastolepis
1.0 Rhodesian Ridgeback