I have a number of loose neck joints on my minifigures. How can I repair them? Any suggestions?
In the old days, minifigures had a dab of paint on the neck. I don't know if it was for this purpose but it would wear off over time. You can paint some nail polish or acrylic on the neck to strengthen that connection. Thin the acrylic (use water based) before applying.
Don't tell anyone, but I've used brushable superglue to put a thin layer on the back of the neck. Then I let it fully dry, and it grips the head fine. Eventually it will wear off. It's cheaper than nail polish and very hard to see.
I'd reccomend getting some clear nail varnish and coating the pin or hole with it. I did this this earlier and it really works. The minor setback is it takes 5 minutes to dry naturaly, or 2 minutes if you apply co2 (breathe on it or blow dry it until it dries to reduce the wait time to 2 minutes). I did this on a Kai, and it works well.