I Sealed My First Custom Figure! Here’s What Happened! 

That's pretty cool! I remember customizers using Mod Podge to get printed out labels to adhere onto wrestling figs to simulate the often elaborate deco wrestlers have on their gear. But not for sealing paint, and for that price, it's a worth a try for any into customizing.

You did an amazing job on that figure.

I use modge Podge on all my dioramas every thing I do I use modgepodge on it

Nice job bro! Is that stuff self leveling? When I was building model cars I would seal them with a floor wax called Future. It was self leveling. Used a sponge brush to apply. Before you primed did you wash the figure? Maybe impurities on the printed plastic caused the primer to come off?