Resin not curing properly in glass bottle

[Lefty]

Hello!
I recently got into resin casting so I'm fairly new. My latest project is creating a prop from my favorite video game, Fallout. I'm trying to make the prop using resin in a glass coke bottle but I'm having a few issues. The first issue is it not curing correctly at the bottom. It seems to stay liquid while the rest of it cures just fine but I have no idea why. The second issue is the bubbles. No matter what I do, I end up with a small layer of bubbles at the very top that is next to impossible to get rid of. When it finally pops and cures, it makes a really ugly circle around the top and it's really bugging me. Anyone got any advice on how to deal with these issues? I've searched everywhere but nobody else seems to work with resin in glass bottles like this :'D

[Fleafa]

What kind of resin are you using? Polyester, polyurethane or epoxy?
Avoid introducing bubbles by stirring resin slowly - this is dependent on the gel time/pot life.
Bubbles can be encouraged to leave by vibration - tapping the bottle repeatedly on a hard surface or placing it on a washing machine during spin cycle may help (in a container to prevent it toppling over). Failing those methods, you're looking at a vacuum pump to remove them.